((x+y)-(x-y)+2y(x-y) =x+y-(x-2xy+y)+2xy-2y =2xy+2xy-2y =2y(2x-y) =2y×10 =20y 20y÷4y=5
已知2x-y=10,求((x+y)-(x-y)+2y(x-y))÷4y的值
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