1.若x2-x-m=(x-m)(x+1)且x≠0,则m等于
A.-1 B.0 C.1 D.2
2.(x+q)与(x+)的积不含x的一次项,猜测q应是
A.5 B. C.- D.-5
3.下列四个算式:①4x2y4÷xy=xy3;②16a6b4c÷8a3b2=2a2b2c;③9x8y2÷3x3y=3x5y;
④(12m3+8m2-4m)÷(-2m)=-6m2+4m+2,其中正确的有
A.0个 B.1个 C.2个 D.3个
4.设(xm-1yn+2)·(x5my2)=x5y3,则mn的值为
A.1 B.-1 C.3 D.-3
5.计算[(a2-b2)(a2+b2)]2等于
A.a4-2a2b2+b4 B.a6+2a4b4+b6 C.a6-2a4b4+b6 D.a8-2a4b4+b8