先前面两个通分,3xy/2x(x+y),4xy/2x(x+y);在和最后一个通分,就是3xy(x-y)/2x(x+y)(x-y),4xy(x-y)/2x(x+y)(x-y),2x(x+y)/2x(x+y)(x-y).再化简一下
通分3y/2x+2y,2xy/x2+xy,1/x-y.在线等
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