(2x-y)/3 = (x+3y)/5 =2 求x、y
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y
已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(
若x-y/x+y=5,求x-y/2x+2y+5x+5y/3x-3y的值
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
3x+2y=5 3y+2x=5 求x和y
(2x-y)/3 = (x+3y)/5 =2 求x、y
|3x-y+5|+(2x-y+3)²=0 求x=?y=?
(2x+3y)除以(5x-3y)=3/5求x比y
求5x-2y=x-y=4x-3y-2的解