3x+y=22 5x-2y=0
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
若3x-5y=0,则x+y/x=(),x-y/y=(),2x-3y/2x+3y=( )
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
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
已知x*x+4x+y*y-2y+5=0,则x*x+y*y=?
{2x+y/3-2y=0 2(2x+y)-5=7y
{5x-2y=7y+2x 3x+2y=22
|3x-y+5|+(2x-y+3)²=0 求x=?y=?
x-3y=0,求2X+5Y\3X-2Y
若2x-3y=0,求5x+4y/3x-2y
求值:x+3y分之x-2y,3x-5y=0