计算:(1)2x2y•(-3xy)÷(xy)2(2)(-2a)•(3a2-a+3)(3)(x+3)(x+4)-(x-1)2(4)(x+3)(x-3)(x2-9)(5)[2a3x2•(a-2x)-34a

题目简介

计算:(1)2x2y•(-3xy)÷(xy)2(2)(-2a)•(3a2-a+3)(3)(x+3)(x+4)-(x-1)2(4)(x+3)(x-3)(x2-9)(5)[2a3x2•(a-2x)-34a

题目详情

计算:
(1)2x2y•(-3xy)÷(xy)2
(2)(-2a)•(3a2-a+3)
(3)(x+3)(x+4)-(x-1)2
(4)(x+3)(x-3)(x2-9)
(5)[2a3x2•(a-2x)-
3
4
a2x2]
÷(-ax)2
题型:解答题难度:中档来源:不详

答案

(1)原式=2x2y•(-3xy)÷x2y2=-6x3y2÷x2y2=-6x;
(2)原式=-2a•3a2-(-2a)•a+(-2a)×3=-6a3+2a2-6a;
(3)原式=x2+4x+3x+12-(x2-2x+1)=x2+4x+3x+12-x2+2x-1=9x+11;
(4)原式=(x2-9)(x2-9)=x4-81;
(5)原式=(2a4x2-4a3x3-class="stub"3
4
a2x2)÷a2x2=2a2-4ax-class="stub"3
4

更多内容推荐