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A组一、填空题1.(x-y)n(n为偶数)=.2.(a-b)2-(a+b)2=.3.x2-5x-14=.4.x2+x+m=(x+n)2,则m=,n=.5.()2+12xy+9y2=()2.6.a+b-ab-1=(a-1)().7.x2-2xy+y2-z2=()().8.a4+a2-20=()()().9.32002-5×32001+6×32000=.10.4(1-b2+ab)-a2=.二、选择题1.把多项式4x-x2-4分解因式,结果正确的是(
Group A 1. Fill in the blank 1. (xy)n (n is even) = .2.(ab)2-(a+b)2=.3.x2-5x-14=.4.x2+x+m =(x+n)2, then m=,n=.5.()2+12xy+9y2=()2.6.a+b-ab-1=(a-1)().7.x2-2xy +y2-z2=()().8.a4+a2-20=()()().9.32002-5×32001+6×32000=.10.4(1-b2+ab)-a2=.II. Select Problem 1. Decompose the polynomial 4x-x2-4 and the result is correct (