(a-b)²/[2(a-b)(a+b)]-2(a²+b²)/[2(a-b)(a+b)]等于

来源：学生作业帮编辑：大师作文网作业帮分类：数学作业时间：2024/09/30 04:16:20

(a-b)²/[2(a-b)(a+b)]-2(a²+b²)/[2(a-b)(a+b)]等于多少?(a-b)²-2(a²+b²)是怎么减的?

(a-b)²-2(a²+b²)
=a²-2ab+b²-2a²-2b²
=-a²-2ab-b²
=-(a²+2ab+b²)
=-(a+b)²

所以(a-b)²/[2(a-b)(a+b)]-2(a²+b²)/[2(a-b)(a+b)]
=-(a+b)²/[2(a-b)(a+b)]
=-(a+b)/[2(a-b)]

(a-b)(a+b)²-(a+b)(a-b)²+2b(a²+b²) (b-a)*(b-a)+(b-a)*2*a等于多少? 化简 (a²+b²/a²-b²-a-b/a+b)÷2ab/(a-b)(a+b)& （a+b/b-a）+（2a/a-b）-(b-a/2b)等于多少若a/b=2 则a*a-ab+b*b/a*a+b*b等于? 化简 (a+b)²+2a(a-1/2b)-3(a-b)(a+b) (b-a)(a-b)³(a-b)²等于多少化简 (a-b)(a+b)²-(a+b)(a-b)²+2b(a²+b²) (a-2b)(a+3b)等于计算代数式a-b+(a-2b)(a-b)+(a-2b)(a-b)²+(a-2b)(a-b)^3 当a=-3&# [（a+2b)(a-2b)-(2a-b)²+(3a-b)(3a-5b)]÷2a a(a-2b)+2(a+b)(a-b)+(a+b)²,其中a=-½,b=1