x-y=3则-2(y-x)=?
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若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
若2x=3y,则(x*x+y*y)/x*x=?
(x+y)(x-y)+(x-y)平方-(x-y)(3x-y) 其中x=-2 y=3分之一
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
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(x+y)(2x-3y)=?
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