(完整word版)八年级数学上学期期末考试.pdf

八年级数学上期末考试试卷1、下列图形是轴对称图形的是（）2、下列运算正确的是（）A.（a4）3=a7 B.632 C.(2)3633 D.5 5-10 3、已知点 A（1,5）和 B（2，-2）关于 X轴对称，则（+）2019的值为（）A.0 B.-1 C.1 D.(-3)20194、若等腰三角形一腰的中线把等腰三角形分成了周长分别是15 和 12 的两部分，则等腰三角形的底边长是（）A.7 B.4或 5 C.11 D.7或 11 5、下列多项式不能用完全平方式分解因式的是（）A.+1+24 B.-2+2-2C.-2+14+492 D.29-23+1 6、如果把分式4-3 3中的、都扩大 3 倍，则分式的值（）A.缩小 3 倍 B.扩大 3 倍 C.不变 D.扩大 6 倍7、已知一粒米的质量是0.000021，这个数用科学计数法表示为（）A.21 104 B.2.1105 C.2.1106 D.2.1104 8、已知-1 X=3，则X2X4+X2+1的值是（）A.9 B.7 C.1 12 D.1 79、为任意正整数，代入式子3-中计算时，四名同学算出如下四个结果，其中正确的结果可能是（）A.148822 B.148824 C.148825 D.148829 10、A、B两地相距 180，新修的高速公路开通后，在A、B两地间行使的长途客车，平均车速提高了 50%，而从 A地到 B地的时间缩短了1，若设原来的平均车速为X/，则根据题意可列方程为（）A.180X 180（1+50%）X 1 B.180（1+50%）X 180X 1精品资料-欢迎下载-欢迎下载 名师归纳-第 1 页，共 8 页 -C.180X 180（1-50%）X 1 D.180（1-50%）X 180X 1二、填空题11、若 422k9 是完全平方式，则k=。12、若X2-1X22X2的值为 0，则实数 X的值是。13、在等腰三角形 ABC中，BC边上的高 AD=12 BC，求 BAC。14、在实数范围内因式分解X33X。15、已知关于 X的分式方程mX x-131-x0 的解是非负数，则m的取值范围是。16、如图，已知在 ABC 中，CD是 AB边上的高线，BE平分ABC交 CD于点 E，BC 5，DE 2，则BCE 的面积等于。17、古希腊数学家把1、3、6、10、15、21叫做三角形数，其中1 是第一个三角形数，3 是是第二个三角形数，6 是第三个三角形数依次类推，那么第三角数是 55，第 n 个三角形数是。三、解答题:18、计算：（1）3-2（-4）0（-13）-2 （2）11-X11X21X241X481X819、因式分解：（1）3（-）（-）（2）a(n 1)22a(n 1)a.精品资料-欢迎下载-欢迎下载 名师归纳-第 2 页，共 8 页 -文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E920、解分式方程：(1)XX-2-1 8X2-4（2）2227161xxxxx21、先化简：X2XX2-2X 1（2X-11X），再从-2X2 的范围内选取一个合适的X 的整数值代入求值。22、如图，在平面直角坐标系xOy中，直线 l 是第一、三象限的角平分线。（1）由图观察易知点A（0,2）关于直线 l 的对称点 A，的坐标为（2,0）.请在图中分别标出点B（5,3），C的坐标（-2,5）关于直线 l 的对称点 B，C，位置，然后写出它们的坐标：B，,C，;(2)结合图形观察以上三组点的坐标，可以发现：坐标平面内任意一点P（，）关于第一、三象限的角平分线l 的对称点 P，的坐标为；（3）已知两点 D（1,-3），E（-2，-4），试在直线 l 上确定一点 Q，使点 Q到 D,E 两点的距离之和最小。精品资料-欢迎下载-欢迎下载 名师归纳-第 3 页，共 8 页 -文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E923如图，ABC 中，AB AC，BAC 90，点 D 在线段 BC 上，EDB12C，BEDE，垂足为E，DE 与 AB 相交于点F.试探究线段BE 与 DF 的数量关系，并证明你的结论24、某高速铁路工程指挥部，要对某路段工程进行招标，接到了甲、乙两个工程队的投标书，从投标书中得知：甲队单独完成这项工程所需天数是乙队单独完成这项工程所需天数的23；若由甲队先做 20 天，剩下的工程再由甲、乙两队合作60 天完成。（1）求甲、乙两队单独完成这项工程各需多少天？l1 1 A AC D E B 精品资料-欢迎下载-欢迎下载 名师归纳-第 4 页，共 8 页 -文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9（2）已知甲队每天的施工费为8.6 万元，乙队每天的施工费为5.4 万元，工程预算的施工费用为1000万元，若在甲、乙工程队工作效率不变的情况下使施工时间最短，问拟安排预算的施工费用是否够用，若不够用，需追加预算多少？25.如图 12 所示，已知 ABC 中，AB AC 10 厘米，BC 8 厘米，点 D为 AB的中点（1）如果点 P在线段 BC上以 1 厘米/秒的速度由 B点向 C点运动，同时点 Q在线段 CA上由 C点向A点运动若点Q的运动速度与点P的运动速度相等，经过3 秒后，BPD与CQP是否全等？请说明理由；若点 Q的运动速度与点 P的运动速度不相等，当点Q的运动速度为多少时，能够使BPD 与CQP全等？（2）若点Q以（1）中的运动速度从点 C出发，点P以原来的运动速度从点B同时出发，都逆时针沿ABC三边运动，求经过多长时间点P与点Q第一次在ABC的哪条边上相遇？精品资料-欢迎下载-欢迎下载 名师归纳-第 5 页，共 8 页 -文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9答案：1-5 BDADC 6-10 ABCBA 11、6.12、1.13、75，15或 90.14、X（X 3）（X3）.15、0 且 3 16、5.17、10；（1）218、（1）7 89.(2)161-X1619、（1）()（1）（1）；（2）（-2）2.20、（1）无解，（2）3 21、原式=X2X-1.X1,0，X2，原式 4 22、（1）B，（3,5）C，（5，-2）（2）P，（，）（3）略23解：BE12DF.证明如下如图，过点 D 作 DHAC，交 BE 的延长线于点H，交 AB 于点 G.DHAC，BDH C.EDB12C，EDB12BDH.EDB EDH.在 EDB 与 EDH 中，EDB EDH，EDED，BED HED90，EDB EDH.精品资料-欢迎下载-欢迎下载 名师归纳-第 6 页，共 8 页 -文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9BEHE，即 BE12BH.ABAC，BAC 90，ABC C45.又 DHAC，BGD90，BDG 45.BGDG，BGH DGB 90.又 BEDE，BFEDFG，GBH GDF.GBH GDF.BHDF.BE12DF.设乙队单独完成这项工程需要x 天，则甲队单独完成这项工程需要23 x 天 根据题意，得2023 x60（123 x1X）1 解得：x=180经检验，x=180是原方程的根23 X=23 180=120，答：甲、乙两队单独完成这项工程分别需120 天和 180 天；（2）设甲、乙两队合作完成这项工程需要y 天，则有Y（1180+1120）1 解得y=72需要施工费用：72（8.6+5.4）=1008（万元）10081000工程预算的施工费用不够用，需追加预算8 万元25.解：（1）t=3 秒，BP=CQ=1 3=3(厘米)，AB=10 厘米，点D为AB的中点，精品资料-欢迎下载-欢迎下载 名师归纳-第 7 页，共 8 页 -文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 HE9D8G2S10B8 ZO8R4L10W3E9文档编码:CL7T8R9R3J8 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