四分之一(x+y)²-3(x-y)³+二分之一(x+y)²-5(x-y)³=
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![四分之一(x+y)²-3(x-y)³+二分之一(x+y)²-5(x-y)³=](/uploads/image/z/10200229-61-9.jpg?t=%E5%9B%9B%E5%88%86%E4%B9%8B%E4%B8%80%28x%2By%29%26%23178%3B-3%EF%BC%88x-y%29%26%23179%3B%2B%E4%BA%8C%E5%88%86%E4%B9%8B%E4%B8%80%EF%BC%88x%2By%29%26%23178%3B-5%EF%BC%88x-y%29%26%23179%3B%3D)
四分之一(x+y)²-3(x-y)³+二分之一(x+y)²-5(x-y)³=
四分之一(x+y)²-3(x-y)³+二分之一(x+y)²-5(x-y)³
=
四分之一(x+y)²-3(x-y)³+二分之一(x+y)²-5(x-y)³=
=(1/4+1/2)(x+y)²+(-3-5)(x-y)³
=3/4(x+y)²-8(x-y)³
=[3/4-8(x-y)](x+y)²
=(3/4-8x+8y)(x+y)²