若2x+3y=2011,则2(3x-2y)-(x-y)+(-x+9y)=?
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若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
若2x=3y,则(x*x+y*y)/x*x=?
若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值
若3x-5y=0,则x+y/x=(),x-y/y=(),2x-3y/2x+3y=( )
若x+2y分之x-y=3,则代数式x+2y分之2(x-y)-3(x-y)分之x+2y的值为
若x+y=4,则多项式1/2(x+y)+4(x-y)-3(x-y)-3/2(x+y)-x+y值是()
若x-y不等于0,2x-3y=0,则分式(10x-11y)/(x-y)的值是()?(10x-11y)/(x-y) =[(8x-8y)+(2x-3y)]/(x-y) =8为什么8X-8Y=8?(10x-11y)/(x-y)=[(8x-8y)+(2x-3y)]/(x-y)=8+(2x-3y)]/(x-y)=8+0=8
若x、y互为相反数,则x+2x+3x+...100x+100y+99y+98y+...+y
(5)若x/2=y/3(y不为0)则x/y=____,x+y/y=___,y/x-y=___.
(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)
(x+y)(2x-3y)=?
若2x+3y=2004,则代数式2(3x-2y)-(x-y)+(-x+9y)=...
若x,y满足|2x-y-3|+|3x+2y+1|=0,则x= y=
若线段x ,y 满足[2x-3y]*[3x+2y]=0 则x/y=?
若2x+y=2012,则代数式2(3x-2y)-(x-y)+(-x+9y)=
若x,y满足|x-y+1|+(x+y+3)^2=0则x^2-y^2=