0.58=(0.5x+0.7y)/(x+y)
0.58(x+y)=0.5x+0.7y
0.58x+0.58y=0.5x+0.7y
0.58x-0.5x=0.7y-0.58y
0.08x=0.12y
x：y=0.12:0.08=3:2
0.58=(0.5x+0.7y)/(x+y)求X比y怎么求
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