3x+y=14 5x+y=20 求x.y的解 详细的解答过程?

已知:3x-5y=0,求x/y,x-y/y,x-y/x 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) (x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5) {(x+y)/2+(x-y)/3=1,(x+y)-5(x-y)=2.求x=?,y=? |x|=3 |y|=5 |x-y|=|x|+|y| 求 X+Y和 X-Y 等于多少 （x+y-5)*（x+y-5)+（x-y+3)=0 x*x-y*y 6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5 已知3x =2y 求x/x+y+y/x-y-y²/x²-y² 已知x-y=3,求[（x+y)(x-y)-(x-y)^2+2y(x-y)]除以的值 5X+Y=3 X+5Y=2 求x和y.5X+Y=3X+5Y=2求x和y. 若(-x+6):(x-y):(4x+y)=3:14:1,求x+y 若(-x+6):(x-y):(4x+y)=3:14:1,求x+y (-x+6):(x-y);(4x+y)=3;14:1,求x+y的值. 已知：4x = 5y,求(x+y) ：y 已知x.x+y.y-6x-8y+25=0,求3x.x+5y的值 若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值 已知：x*x+√3y=√5,y*y+√3x=√5,且x≠y,求 y/x+x/y 若x-y/x+y=5,求x-y/2x+2y+5x+5y/3x-3y的值