1/x²-y²,1/x²+xy.通分

问题描述:

1/x²-y²,1/x²+xy.通分

x/x(x+y)(x-y) , (x-y)/x(x-y)(x+y)

1/x²-y²= 1/(X+Y)(X-Y)
1/x²+xy= 1/ X(X+Y)
通分
1/x²-y²= X /X(X+Y)(X-Y)
1/x²+xy=(X-Y)/X(X+Y)(X-Y)
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