计算3y/(2x+2y)+2xy/x^2+xy
人气：187 ℃ 时间：2020-01-28 01:26:42
解答
3y/(2x+2y)+2xy/(x^2+xy)
=3y/[2(x+y)] + 2y/(x+y)]
=(3y+4y)/[2(x+y)]
=7y/[2(x+y)]
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