{2x+y/3-2y=0 2(2x+y)-5=7y
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
{2x+y/3-2y=0 2(2x+y)-5=7y
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
解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y
若3x-5y=0,则x+y/x=(),x-y/y=(),2x-3y/2x+3y=( )
5(x+y-2)=3-y
已知x*x+4x+y*y-2y+5=0,则x*x+y*y=?
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1