通分 x-y/2x+2y 与 xy/(x+y)² 的

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：2024/11/10 14:55:14

(x-y)/(2x+2y) =(x-y)/2(x+y)=(x-y)(x+y)/2(x+y)²=(x²-y²)/2(x+y)²
xy/(x+y)²=2xy/2(x+y)²
x-y/2x+2y 与 xy/(x+y)²相加= (x²-y²)/2(x+y)²+2xy/2(x+y)²=(x²-y²+2xy)/2(x+y)²

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