2021年八年级数学一次函数单元测试.pdf
精品好资料欢迎下载第七章一次函数单元测试一、选择题(每题3 分,共 30 分)1、下列函数关系中表示一次函数的有()12 xyxy1xxy21ts60 xy25100 A.1个 B.2个 C.3个 D.4个2、下列函数中,图象经过原点的为()Ay=5x+1 By=-5x-1Cy=-5xDy=51x3、一水池蓄水20 m3,打开阀门后每小时流出5 m3,放水后池内剩下的水的立方数Q(m3)与放水时间t(时)的函数关系用图表示为()4、已知点(-4,y1),(2,y2)都在直线y=-12 x+b 上,则 y1、y2大小关系是()(A)y1 y2(B)y1=y2(C)y1 0,b0 B.k0,b0 C.k0 D.k0,b0?5、(8 分)右图是某汽车行驶的路程S(km)与时间 t(分)的函数关系图,观察图中所提供的信息,解答下列问题:汽车在前 9 分钟内的平均速度是km/分;汽车在中途停了多长时间?;当 16t30 时,S与 t 的函数关系式.0 S(km)t(分)9 30 40 12 16-1-2|精.|品.|可.|编.|辑.|学.|习.|资.|料.*|*|*|*|欢.|迎.|下.|载.第 5 页,共 7 页文档编码:CU3K2S9V9L3 HG8B4D8V3Y4 ZA8O5C7G8Y3文档编码:CU3K2S9V9L3 HG8B4D8V3Y4 ZA8O5C7G8Y3文档编码:CU3K2S9V9L3 HG8B4D8V3Y4 ZA8O5C7G8Y3文档编码:CU3K2S9V9L3 HG8B4D8V3Y4 ZA8O5C7G8Y3文档编码:CU3K2S9V9L3 HG8B4D8V3Y4 ZA8O5C7G8Y3文档编码:CU3K2S9V9L3 HG8B4D8V3Y4 ZA8O5C7G8Y3文档编码:CU3K2S9V9L3 HG8B4D8V3Y4 ZA8O5C7G8Y3文档编码:CU3K2S9V9L3 HG8B4D8V3Y4 ZA8O5C7G8Y3文档编码:CU3K2S9V9L3 HG8B4D8V3Y4 ZA8O5C7G8Y3文档编码:CU3K2S9V9L3 HG8B4D8V3Y4 ZA8O5C7G8Y3文档编码:CU3K2S9V9L3 HG8B4D8V3Y4 ZA8O5C7G8Y3文档编码:CU3K2S9V9L3 HG8B4D8V3Y4 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