2y-x=3,2x-y=36怎么解?

2x=y 3y=x怎么解 由X/Y=2Y/X-Y 怎么解得x=2y? x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 {2X=5(X+Y)3X-10(X+Y)=2怎么解? 3x*5y+2x*6y=2.7*(3x+2x)怎么解 (x/y)2-(x/y)=1怎么解? 3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2 x-3y=2 y=x 怎么写 3x+2=y 5x+4=y 7x+6=y 9x+8=y 11x=y怎么解 x^2-4xy+3y^2=（x-3y)(x-y)x^2-4xy+3y^2 怎么分解成（x-3y)(x-y) x-y=2y 0.2x+3y=1 这个二元一次方程怎么解? 4x方y/(x-2y)(x+2y)怎么算[x方/x-2y]-4x方y/(x-2y)(x+2y)=? 2y-x=3,2x-y=36怎么解? 3（x+y）+2(x-y)=36,2(x+y)-3(x-y)=24 解二元一次方程 3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2 解方程组 (x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= (x+y)(x-y)+(x-y)平方-(x-y)(3x-y) 其中x=-2 y=3分之一 X+y=15 2x-y=5y-x怎么解