3(X-1)+2(Y+1)=8 2(X-1)-3Y=1的解
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:3x=8y.求(1)x+y/y (2)2x+3y/x-2y
(3x-y)^2+(3x+y)(3x-y),x=1,y=-2
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
1奥数题x-2y/x+2y=3,求x-2y/3(x+2y)-3(x-2y)/x-2y的差
若x=-1/4,能否确定代数式(2x-y)(2x+y)+(2x-y)(y-4x)+2y(y-3x)的值?
9y=3x-(x-1),4(x+y)-(2x+4)=8y
2(x+y) 3x+3y=24 x+y/2x x y/2y= 1
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
若x、y满足2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值
解方程组:根号(x+1/y)+根号(x+y-3)=3 2x+y+1/y=8
已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(