若x+y=3则4-2x-2y=
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若x+y=3则4-2x-2y=
若x+y=3则4-2x-2y=
若x+y=3则4-2x-2y=
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)/(x+y)=3 则(x+2y)/(6x-7y)等于
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
若2x=3y,则(x*x+y*y)/x*x=?
若5x+3y=3x+4y=x+2y+6,则x+y=___
若x/y=4/3 则3x+2y/2x-5y=
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
若x,y,z成等差数列,则(z-x)^2-4(x-y)(y-x)=
若3x-5y=0,则x+y/x=(),x-y/y=(),2x-3y/2x+3y=( )
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
2x-y/x+y=4,则4x-2y/2x+2y+3x+3y/2x-y
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=-1/4,能否确定代数式(2x-y)(2x+y)+(2x-y)(y-4x)+2y(y-3x)的值?
若x-2y=5,则式子12-x+2y=.以知3x-4y=2x+y则x∶y=
若X=负四分之一,能否确定代数式(2X-Y)(2X+Y)+(2X-Y)(Y-4X)+2Y(Y-3X)的值?
若|2x-y+5|+(x+2y-4)的平方=0,则(2x-y)的三次方-(x-3y)(y-2x)的平方
若|x-3|+(y+2)=0,则(x-y+4xy/x-y)(x+y-4xy/x+y)的值是