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2 x&菗178;-4 x=-1 x&菗178;-2 x=-1/2 原式=[(x+1)(x-3)][(x+2)(x-4)] =(x&菷178;-2 x-3)(x&菗178;-2 x-8) =(-1/2-3)(-1/2-8) =119/4
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