已知:x+y=2,2y²-y-4=0,求y-x/y的值
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已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]/4y已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]/4y 就是已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]/4y /4y就是除以4y
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已知,x²+2y²-2xy-4y+4=0,求x²+y²的值
已知2x-y=10 【(x²+y²)-(x-y)²+2y(x-y)】÷4y 过程
已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]÷4y的值
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2x-y=2,求[(x²+y²)-(x-y)²+2y(x-y)]÷4y
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