题目内容
计算(-2.5x3)2·(-4x)3=
A.40x9
B.-40x9
C.400x9
D.-400x9
计算下题:5x3·(-2x2y);
计算:(1)2x2?5x3 (2)(x+2)(x-3) (3)(1+2c)(1-2c) (4)(-6x2)2+(-3x)3?x