{2x+3y=7,{3x+2y=8的解
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y
已知实数x.y满足根号(x+y-8)+根号(8-x-y)=根号(3x-y-4)+根号(x-2y+7),求x,y
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
已知方程组2x-y=7,3x+y=8 x和y的解的过程
【2(x-y)的3次方-8(x-y)的2次方(x+y)+6y(x-y)的平方】/2(x-y)的平方=?
若x、y满足2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值
求x+y/3+x-y/2=6 3(x+y)-2(x-y)=28方程组的解
已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y
2x-y=7,3x+y=8
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
已知x-2y=2016,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除以8x的值