2x-5y/x-y等于3/2,x/y得多少?

（4x-3y)(5x+2y)-2x(9x-5y) 等于多少 3x-2y等于75 3y-2x等于5 x=?Y=? (3x-5y)-(3x-2y)等于几 [(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除4X等于好多 若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于 3y/x*x-y*y+x/x*x-2xy+y*y+6y*y/x*x*x-x*x*y-xy*y+y*y*y等于多少? 化简2x-(x-y)-y等于 化简:5(x-y)+2(x+y)-3(x-y) 2x-5y/x-y等于3/2,x/y得多少? x-y/3=x+y/2 2x-5y=7等于多少 4x+5y=105,2x+3y=178,x,y等于 已知 2x-3y/y等于2 求x-y/2x 求x-3y/2x+y (3X+2Y)*(4X+5Y)*(3X-2Y)*(5Y-4X) 等于多少? 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) (2x-3y)-(5x-y) (2X-3y)-(5x-y) (2x-5y)(3x+y) 因式分解(x-2y)(x-3y)+(x-4y)(x-5y)+（x-3y)(x-5y)+(x-2y)(x-4y)