计算(1)(6a2-8a+11b3)-(11a2+2b3)(2)(3x+9)(6x+8)(3)(4a3b-6a2b2+12ab3)÷2ab(4)(x+2)2-(x+1)(x-1)-数学

题目简介

计算(1)(6a2-8a+11b3)-(11a2+2b3)(2)(3x+9)(6x+8)(3)(4a3b-6a2b2+12ab3)÷2ab(4)(x+2)2-(x+1)(x-1)-数学

题目详情

计算
(1)(6a2-8a+11b3)-(11a2+2b3
(2)(3x+9)(6x+8)
(3)(4a3b-6a2 b2+12ab3)÷2ab
(4)(x+2)2-(x+1)(x-1)
题型:解答题难度:中档来源:不详

答案

(1)原式=6a2-8a+11b3-11a2-2b3
=(11b3-2b3)+(6a2-11a2)-8a
=9b3-5b2-8a;
(2)原式=18x2+24x+54x+72
=18x2+78x+72;
(3)原式=4a3b÷2ab-6a2 b2÷2ab+12ab3÷2ab
=2a2-3ab+6b2;
(4)原式=x2+4x+4-x2+1
=4x+5.

更多内容推荐