3x+2y=5 3y+2x=5 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. (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: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 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=1 5x-2y=8 3x-y=7 2x-y=3x表示y和用y表示x y=x^3-5x^2+2x-8 求y^2求y撇 6x+5Y=31 2X+3Y=17求X求 Y 已知(x+y):y=8:3,求2x+5y/3x-y和x^2-xy/y^2+3xy的值 已知x/3=y/5=z/4,求x+y+z/y和x+y-z/y-x的值,2种方法.急等. 已知x-y=3,求[（x+y)(x-y)-(x-y)^2+2y(x-y)]除以的值