1、一、选择题1.(2x-1)2等于( )A4x2-4x+1 B2x2-2x+1 C2x2-1 D2x2+1 2.(x+5y)2等于( )Ax2-5y 2 Bx2+10x+25y 2 Cx2+10xy+25y 2 Dx2+x+25y 2 3.(m-5)2 等于( )Am2-5 Bm2-5 2 Cm2-10m+25 D25m2-5 4.(x+5y)2 等于( )Ax2-5y 2 Bx2-10y+5y 2 Cx2+10xy+25y 2 Dx2-y+25y 2 5.(2x-y 2 ) 2 等于( )A2x2-4xy 2+y4 B4x2-2xy 2+y4 C4x2-4xy 2+y4 D4x2-xy 2+y
2、4 6.下面计算正确的是( )A.(a+b)(a-b)=2a+2b B.b5 + b5 = b10 C.x5 .x5 = x25 D.(y-z)2=y2-2yz+z2 7.下面计算错误的是( )A.(y-z).(y+z)=y2-z2 B.(m-n)2=n2-m 2 C.(y+z)2=y2+2yz+z2 D.(y-z)2=y2-2yz+z2 8.(2y-3z)2 等于( )A. 4y2-12yz+z2 B.y2-12yz+9z2 C.4y2-12yz+9z2 D.4y2-6yz+9z2 9 (3z-y)2 等于( )A.9z2-y+y2 B.9z2-yz+y2 C. 9z2-6yz+y2 D3z
3、2-6yz+y2 10 (x+3ab)2 等于( )A.x2+6xab+9a2b2 B.x2+6ab+9a2b2 C.x2+xab+9a2b2 Dx2+6xab+a2b2 11 (c-a2b2)2 等于( )A .c -ab2 B.c2 -2a2b2c+a4b4 C.c-a2b2c+a4b4 Dc2 -2abc+a4b12 c-(a2)22等于( )A .c -a2 B.c2 -2a4c+a8 C.c2 -a2 Dc2 -a413. (c2)2+(a2)22等于( )A .c8 +2ac4+a8 B.c8 +2a4c+a8 C.c8 +2a4c4+a8 Dc8 +a4c4+a8 14.(c+a
4、)2等于( )A. c3 -a3 B. a2+2ac+c2 C. c5 -a5 Dc2 -2ac+a215.(d+f)2等于( )A .d3 -f3 B.d2 +2df+f 2 C.d2 -2f+f 2 Dd2 -df+f 2 2. 填空题.1(5-x2)2等于 ;2(x-2y)2等于 ;3.(3a-4b)2等于 ;4.(2b-2c)2等于 ;三、计算题1.(3a-b)(3a+b)-(a+b)22.(a-b)2 -3(a2+b2)3.2(a2+b2)-(a+b)24.(3a-b)(3a+b)-(2a-b)2答案:一、选择题1.A 2.C 3.C 4.C 5.C 6.D 7.B 8.C9.C 10.A 11 .B 12.B 13. C 14.B 15.B二、填空题.125-10x2+x4 2x2-8xy+4y23.9a2-24ab+16b2 4.4b2-8bc+4c2三、计算题1.解:(3a-b)(3a+b)-(a+b)2=9a2-b2-a2-b2-2ab=8a2-2b2-2ab2.解:(a-b)2 -(a2+b2)=a2-2ab+b2-3a2-3b2=-2a2-2ab-2b23.解:(a-b)(a+b)-a2+b2=2a2-2b2-a2-2ab-b2=a2-2ab+b24.解:(3a-b)(3a+b)-(2a-b)2=9a2-b2-4a2+4ab-b2=5a2+4ab-2b2