3y=18-5x 3x=4+5y 求x,y

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) 3y=18-5x 3x=4+5y 求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 x+5y=4 3x-6y=5 求x ,y 若2x-3y=0,求5x+4y/3x-2y 5x-6y= -28 ,3x+4y=6求x与y 4x-3y=5 x^2+y^2=1 求x,y 求5x-2y=x-y=4x-3y-2的解 3y+12=x 4y+5=x ,求x,y 3x+4y-5=0 x^2+y^2=1求x.y 已知3X=4X,5Y=6Z求X+Y：Y+Z 5x+y=2,x-3y=4,求x和y, 5x+y=2 x-3y=4 求x和y 5x+y=12 x-3y=4 求x和y