计算:(1)(-a)2(a2)2-(2a)3(-a)3(2)(3x+9)(6x-8);(3)(a3b-3a2b2+2ab3)÷(-12ab);(4)(x+2)2-(x+1)(x-1).-数学

题目简介

计算:(1)(-a)2(a2)2-(2a)3(-a)3(2)(3x+9)(6x-8);(3)(a3b-3a2b2+2ab3)÷(-12ab);(4)(x+2)2-(x+1)(x-1).-数学

题目详情

计算:
(1)(-a)2(a22-(2a)3(-a)3
(2)(3x+9)(6x-8);
(3)(a3b-3a2b2+2ab3)÷(-
1
2
ab)

(4)(x+2)2-(x+1)(x-1).
题型:解答题难度:中档来源:不详

答案

(1)(-a)2(a2)2-(2a)3(-a)3
=a2•a4+8a3•a3
=9a6;
(2)(3x+9)(6x-8)=18x2+30x-72;
(3)(a3b-3a2b2+2ab3)÷(-class="stub"1
2
ab)
=-2a2+6ab-4b2;
(4)(x+2)2-(x+1)(x-1)=x2+4x+4-x2+1=4x+5.

更多内容推荐