若x-3y=2,则7-2x+6y=?
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若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
设x,y满足x+3y+|3x-y|=19,2x+y=6则X= Y=
若x-3y=2,则7-2x+6y=?
把6x(x-y)的平方+3(y-x)的立方分解因式我知道答案是6x(x-y)^2+3(y-x)^3=6x(x-y)^2-3(x-y)^3=3(x-y)^2[2x-(x-y)]=3(x-y)^2(x+y)可为什么=6x(x-y)^2-3(x-y)^3=3(x-y)^2[2x-(x-y)]
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
若x+y=4,则多项式½(x+y)+4﹙x-y)-3(x-y)-3/2(x+y)-x+y是多少?
若2x=3y,则(x*x+y*y)/x*x=?
若x、y满足2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值
若|x|=3,|y|=2,且|x-y|=y-x,求x+y的值.
已知:2x+y=6,x-3y=1 求7y(x-3y)(x-3y)-2(3y-x)(3y-x)
若5x+3y=3x+4y=x+2y+6,则x+y=___
若x+3y=3x+2y=7,则x+y=几?
若x^2-y^2=6 x+y=3 则x-y=多少
若2x+2y=6x-3y,则x比y=
实数X,Y满足(2X-3Y)^2+X^2+6X+9=0,则Y=?(X-Y)^2009=?
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
3x(2x+y)-2x(x-y),其中x=1,y=1/5
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2