2022年北师大版七上3.5《去括号》word教案1 .pdf

名师精编优秀教案年级：七年级学科：数学执笔：审核：内容:3.5 去括号课型：新授时间 _年_班 _小组姓名：_ 学习目标:1、使学生初步掌握去括号法则；2、使学生会根据法则进行去括号的运算；3、通过本节课的学习，初步培养学生的“类比”、“联想”的数学思想方法。学习重点：括号前是负号时,去括号后，原括号里的各项符号都要改变学习难点：利用运算律去括号。学习过程：一、预习导学：1、所含字母且的指数的项叫同类项。2.、914xmy4和43x5y2n能合并同类项，则 m=，n=。它们的和为。3、阅读教材 120 页小明、小颖、小刚的做法，请思考它们的结果是否一样？二、合作探究：1、谁能用两种方法分别解这两题?(1)13+2(7-5)；(2)13-2(7-5)小结：这样的运算我们是运用了（）那么，现在，若将数换成代数式，又会怎么样呢?2、谁能仿照刚才的计算，化简一下这两道题?(1)9a+2(6a-a)；(2)9a-2(6a-a)3、思考交流：（1）上述两题的解法中第一种方法和第二种方法区别在哪里?（2）我们是怎么得到多项式去括号的方法的?是从（数的去括号方法）得到的。（3）第(1)小题与第(2)小题的去括号有何不同?名师精编优秀教案（4）你能总结去括号的法则吗？括号前是“+”号，把 _，括号里各项都 _ 符号；括号前是“-”号，把 _，括号里各项都 _符号为了便于记忆，教师引导学生共同完成下面的顺口溜：去括号，看符号：是“+”号，_变号；是“-”号，_变号4、做一做：例 1 判断：下列去括号有没有错误?若有错，请改正：(1)a2-(2a-b+c)=a2-2a-b+c；(2)-(x-y)+(xy-1)=-x-y+xy-1.例 2：根据去括号法则，在 _上填上“+”号或“-”号：(1)a_(-b+c)=a-b+c(2)a_(b-c-d)=a-b+c+d；(3)_(a-b)_(c+d)=c+d-a+b例 3：去括号-a-(b-c)例 4:先去括号，再合并同类项：（1）4a（a3b）（2）a+（5a3b）(a2b)（3）3（2xyy）2xy 三、小结：对照本节的学习目标本节你有哪些收获与困惑？四、课堂检测：1、3(2x3y3x2y231xy3)=_ 2、（4y3）(5y2)3y=_。3、减去 3x 等于 5x23x5 的代数式为。、5x25 B、5x26x5 C、55x2 D、5x26x25 4、下列各式去括号正确的是（）文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3名师精编优秀教案A.3a 2(2ba)=3a2ba B.5(xy)2(y 1)=5x5y2y1 C.1(x yz)=1xyz D.(mn)(mn)=mnm n 5、与 abc 互为相反数的数是（）A.abc B.abc C.abc D.abc 6、化简12()2(3)23xx的结果是()A173xB153xC1156xD1156x7、(1)-（3xy）_(2)已知 m n51,则3(nm)=_ 8.、代数式22aab与23aab的和是 _，差是_9、（选作）猜牌游戏：桌上有左、中、右三堆牌，各堆牌的张数相同。从左边一堆中拿出两张，放在中间一堆中。从右边一堆中，拿出一张牌，放在中间一堆，再从中间一堆拿出若干张放入左边且使左边加倍，则这时中间一堆还剩几张？10、去括号：(1)(2m3)_；(2)n 3(42m)_；(3)16a 8(3b4c)_；(4)t 23(129y)_；(5)(5mn)7(a 3b)_；(6)21(x y)41(p q)_ 11、化简：(1)(2x-3y)+(5x+4y)；(2)(8a-7b)-(4a-5b)；(3)a-(2a+b)+3(a-2b)；(4)(8x-3y)-2(4x+3y-z)+2z；文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 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HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3名师精编优秀教案（5）-3（2s-5）+6(s+1)(6)1-3(2a-1)-2(-3a+3)五、教（学）后记：文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 ZG2P9M9X5V3文档编码:CF9X6C10O10K9 HV5K9F9G9O4 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