3（x+y）+2（x-y)=36,2（x+y）-3（x-y)=24

x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2 （x+y）/2- x-y/2=6 3(x+y)=4(x-y) 2（x-y）²-3(x-y)(-y-x) 3x+y=2 -y/x+y=123x+y=2 （-y/x）+y=12 3（x+y）+2（x-y)=36,2（x+y）-3（x-y)=24 3（x+y）+2(x-y)=36,2(x+y)-3(x-y)=24 解二元一次方程 (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 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) (x+y)(2x-3y)=? 先化简,再求值 [2/3x - 2/x+y（x+y/3x -x-y）]*x/x-y,其中5x+3y=0 x(x-y)2-(y-x)3 [(x-y)²+（x+y）(x-y)]/2xx=3,y=-1.5 [2/3x-2/x+y(x+y/3x-x-y)]/x-y/x 化简：{2/3x-2/(x+y)[(x+y)/3x-x-y]}/(x+y)/x 计算2/3x-2/x+y(x+y/3x-x-y)/x-y/x 化简3x-2/(x+y)[(x+y)/3x-x-y]÷(x-y)/x