3x+2y=36=5x+2y=72怎么算?

二元一次方程(x+y)/2+(x-y)/3=6,4(x+y)-5(x-y)=2怎么算 3x+2y=36=5x+2y=72怎么算? 3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2 4x方y/(x-2y)(x+2y)怎么算[x方/x-2y]-4x方y/(x-2y)(x+2y)=? 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 5x+2y=52=3x+2y=36怎么算? {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+2|怎么算? 2x=y 3y=x怎么解 x-3y=2 y=x 怎么写 x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2 4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11 3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27 6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5 (x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5) (2x+y-1)(2x-y-1)=?和（3x+y-5a）的平方怎么算