5X+Y=3 X+5Y=2 求x和y.5X+Y=3X+5Y=2求x和y.

已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 5X+Y=3 X+5Y=2 求x和y.5X+Y=3X+5Y=2求x和y. 已知:3x-5y=0,求x/y,x-y/y,x-y/x |x|=3 |y|=5 |x-y|=|x|+|y| 求 X+Y和 X-Y 等于多少 (x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5) 3x+2y=5 3y+2x=5 求x和y 5x+y=2,x-3y=4,求x和y, 5x+y=2 x-3y=4 求x和y {(x+y)/2+(x-y)/3=1,(x+y)-5(x-y)=2.求x=?,y=? 已知x+y=-5,x*x+y*y=19求xy和（x-y)*(x-y)的值 求(X+Y)(X-Y)(X²+Y²),X=5 Y=2, 已知5x-4y=0,求x:y和x+y:y的值 5x+y=12 x-3y=4 求x和y 已知7Y=X-3,8Y=X+5 求X和Y 若x-y/x+y=5,求x-y/2x+2y+5x+5y/3x-3y的值 若x+y分之x-y=3,求式子x+y分之5(x-y)—2(x-y)分之x+y的值 若x-y分之x+y=3,求式子x+y分之5(x-y)—2（x-y）分之x+y的值 （x+y-5)*（x+y-5)+（x-y+3)=0 x*x-y*y