分式,怎么解,怎么解,
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分式,怎么解,怎么解,
分式,怎么解,
怎么解,
分式,怎么解,怎么解,
a²/(a-1) - (a-1)²/(a-1) 第一步通分
=[a²-(a-1)²]/(a-1)
=[a²-a²+2a-1]/(a-1)
=(2a-1)/(a-1)