[12(x+y)³+3(x+y)(x-y)²]÷6(x+y)
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![[12(x+y)³+3(x+y)(x-y)²]÷6(x+y)](/uploads/image/z/1730825-17-5.jpg?t=%5B12%28x%2By%29%26%23179%3B%2B3%EF%BC%88x%2By%EF%BC%89%EF%BC%88x-y%EF%BC%89%26%23178%3B%5D%C3%B76%EF%BC%88x%2By%EF%BC%89)
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[12(x+y)³+3(x+y)(x-y)²]÷6(x+y)
[12(x+y)³+3(x+y)(x-y)²]÷6(x+y)
[12(x+y)³+3(x+y)(x-y)²]÷6(x+y)
[12(x+y)³+3(x+y)(x-y)²]÷6(x+y)
=2(x+y)²+(x-y)²/2
[12(x+y)³+3(x+y)(x-y)²]÷6(x+y)
=3(x+y)[4(x+y)²+3(x-y)²]÷6(x+y)
=[4(x+y)²+3(x-y)²]÷2
=[4x²+8xy+4y²+3x²-6xy+3y²]÷2
=(7x²+2xy+7y²)/2
(x+y)<>0时,分子分母同时除以(x+y),再拆去里面的小括号 则 原式=(12x^2+12y^2+3x^2+3y^2+18xy)/6=2.5(x^2+y^2+3xy)