通分:第一题1/6ab²,1/9a²bc.第二题a-1/a²+2a+1,6/a²-1.
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通分:第一题1/6ab²,1/9a²bc.第二题a-1/a²+2a+1,6/a²-1.
通分:第一题1/6ab²,1/9a²bc.第二题a-1/a²+2a+1,6/a²-1.
通分:第一题1/6ab²,1/9a²bc.第二题a-1/a²+2a+1,6/a²-1.
3ac/18a²b²c,2b/18a²b²c 第二题(a-1)*(a-1)/(a²+2a+1)*(a-1),6(a+1)/(a²+2a+1)*(a-1)