2019年春七年级数学下册第一章整式的乘除1.7整式的除法课时作业(新版)北师大版.docx

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1、11.7 整式的除法知识要点基础练知识点 1 单项式除以单项式1.下列各式计算正确的是 (B)A.6x62x2=3x2 B.8x84x2=2x6C.a3a3=0 D. a5b a5b=123 322.计算 -5a5b3c15a4b3的结果是 (D)A.3ac B.-3acC. ac D.- ac13 133.(-6a4b2c)(3a3b)= -2abc . 知识点 2 多项式除以单项式4.(-5a4c-5ab2c)(-5ac)等于 (D)A.-a6b2-c B.a5-b2cC.a3b2-a4c D.a3+b25.计算:(20 x4+15x3y-25x2)5x2= 4x2+3xy-5 . 6.计

2、算:(1)(12a3-6a2+3a)3a;解:原式 =4a2-2a+1.(2)(21x4y3-35x3y2+7x2y2)(-7x2y).解:原式 =-3x2y2+5xy-y.综合能力提升练7.计算( -4x)3(-2x)2的结果正确的是 (A)2A.-16x B.16x C.2x D.-2x8.长方形的面积为 4a2-6ab+2a,若它的一边为 2a,则它的周长为 (D)A.4a-3b B.4a-6bC.2a-3b+1 D.8a-6b+29.计算:( -2ab)34ab2 = a2b2 . (-12b)10.小亮与小明在做游戏,两人各报一个整式,小明报的被除式是 x3y-2xy2,商式必须是

3、2xy,则小亮报的除式是 x2-y . 1211.已知 6m4nx2myn2=3mn,则 x= 3 ,y= 3 . 12.已知一个三角形的面积为 8x3y2-4x2y3,一条边长为 8x2y2,则这条边上的高为 2x-y . 13.若 A= ,则 A的值为 2 . 20162+20172+120162017+114.观察下列等式:(x2-1)(x-1)=x+1;(x3-1)(x-1)=x2+x+1;(x4-1)(x-1)=x3+x2+x+1;(x5-1)(x-1)=x4+x3+x2+x+1. (x7-1)(x-1)= x6+x5+x4+x3+x2+x+1 ; 根据 的结果,则 1+2+22+2

4、3+24+25+26+27= 28-1 . 15.先化简,再求值:( x+y)(x-y)-(4x3y-8xy3)2xy,其中 x=1,y=-3.解:原式 =x2-y2-2x2+4y2=-x2+3y2.当 x=1,y=-3时,原式 =-12+3(-3)2=26.16.一颗人造地球卫星的速度为 2.88109 m/h,一架喷气式飞机的速度为 1.8106 m/h,这颗人造地球卫星的速度是这架喷气式飞机的速度的多少倍?解:(2 .88109)(1.8106)=(2.881.8)(109106)=1.6103=1600.答:这颗人造地球卫星的速度是这架喷气式飞机的速度的 1600倍 .317.已知实数 a,b,c满足 |a+1|+(b-5)2+(25c2+10c+1)=0,求( abc)251(a11b8c7)的值 .解:由题意知 a=-1,b=5,c=- ,15(abc)251(a11b8c7)=(abc)251(abc)7a4b= .15拓展探究突破练18.如图 1的瓶子中盛满水,如果将这个瓶子中的水全部倒入图 2的杯子中,那么你知道一共需要多少个这样的杯子吗?(单位:cm)解: a 28 = a2= (12a)2h+ (122a)2H 1212 (14 a2h+ a2H)12h+2H.12即需要 个这样的杯子 .(12h+2H)

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