{3x-2y=7 {x+3/2-y=0 方程组解,
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7y(x-3y)-2(3y-x)=0 .x=?,y=?
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
(x+y)(x-y)+(x-y)平方-(x-y)(3x-y) 其中x=-2 y=3分之一
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
{2x+y/3-2y=0 2(2x+y)-5=7y
(x+y)(2x-3y)=?
已知:2x+y=6,x-3y=1 求7y(x-3y)(x-3y)-2(3y-x)(3y-x)
y^2+2y-x=3x^7,x=0时y的导数
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
已知x-y=3,求[(x+y)(x-y)-(x-y)^2+2y(x-y)]除以的值
已知3x =2y 求x/x+y+y/x-y-y²/x²-y²
先化简,再求值 [2/3x - 2/x+y(x+y/3x -x-y)]*x/x-y,其中5x+3y=0
先化简,再求值:[3x-2/x+y(x+y/3x-x-y)]/(x-y/x),其中5x+3y=0
已知7x+5y/2y-x=3/2,且x≠0,求X/x-4y
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值
3x+5y-(x+y)=6 2(x+y)-3x=-7