[(x²+y²)-(x-y)²+2y(x-y)]÷(4y) 化简[(x²+y²)-(x-y)²+2y(x-y)]÷(4y) 化简[(x²+y²)-(x-y)²+2y(x-y)]÷(4y)如果2x-y=0 [(x²+y²)-(x-y)²+2
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