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![(1)5(x-y)立方+10(y-x)平方(2)18b(a-b)平方-12(a-b)立方(3)2a(x-a)+4b(a-x)-6x(x-a)(4)x(x-2)-3](/uploads/image/z/1990594-10-4.jpg?t=%EF%BC%881%EF%BC%895%28x-y%29%E7%AB%8B%E6%96%B9%2B10%EF%BC%88y-x%EF%BC%89%E5%B9%B3%E6%96%B9%EF%BC%882%EF%BC%8918b%EF%BC%88a-b%EF%BC%89%E5%B9%B3%E6%96%B9-12%EF%BC%88a-b%EF%BC%89%E7%AB%8B%E6%96%B9%EF%BC%883%EF%BC%892a%EF%BC%88x-a%EF%BC%89%2B4b%28a-x%29-6x%28x-a%29%284%29x%28x-2%29-3)
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