北师大版七年级下册数学第一章整式的乘除计算题训练(1)(有答案).pdf

整式的乘除计算训练（整式的乘除计算训练（1 1）1.(a b)(2a b)2.(x+2)(y+3)-(x+1)(y-2)3.(2x y)(2x y)2y2 4.5.4x yx22 y 6.7.2a 12 22a 1 3 8.9.(x3y)(x+3y)(x3y)2x(x2)(x+5)(x5)(3x2y)(2y3x)(4y29x2)x 12x 1x 210.3(x1)(x1)(2x1)211.(3x2y)2(3x2y)2 12.(x y)2(x y)213.0.125100 81004514.54221(x)(2)320022006111215.(）（1）（）（）1423321619 题用乘法公式计算16.9991001 17.992118.982 19.20092 2008201020.化简求值：(2a 1)2(2a 1)(a 4)，其中a 2。21.化简求值(x2y)22(x y)(x y)2y(x3y),其中x 2,y。1222.5(x1)(x+3)2(x5)(x2)23.(ab)(a2+ab+b2)24.(3y+2)(y4)3(y2)(y3)25.a(bc)+b(ca)+c(ab)26.(2mn2)24mn3(mn+1)27.328.(x2)(x+2)29.530.(x3y)(x+3y)(x3y)2 31.(xy(2x)3(14y2)2108(3102)a+bc)(abc)答案答案1.a 2b 2.5x+y+8 3.4x2+y2 4.2x+255.x2 4y2 6.16y4 81x4 7.4a2+2 8.x+39.6xy 18y2 10.x2+4x 4 11.24xy 12.x4 2x2y2+y413.1 14.10 15.16216.原式=(1000-1)(1000+1)17.原式=(99+1)(99-1)=1000000-1 =10098 =999999 =980018.原式=(900-2)2 19.原式=20092-(2009+1)(2009-1)1=10000-400+4 =20092-20092+1 =9604 =120.原式=6a2+3a 3，当a=2时，原式=6 (2)2+3 (2)3=1521.原式=x2+6xy，当x=2，y=2时，原式=(2)2+6 (2)2=1022.3x2+24x 35 23.a3 b3 24.5y 26 25.026.4mn3 27.2x4y5 28.x2 4x 4 29.1.5 101130.6xy 18y2 31.a2 2ac+c2 b2311