上下同乘,给个例子吧6分之1=6分之1乘以1=6分之1乘以6分之6,因为六分之六=1
将1/x和1/y通分 原式=(1/x)(y/y)+(1/y)(x/x)=y/xy+x/xy=(x+y)/xy 其中=(1
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