2X+3Y=18 3X+2Y=19 求x、y的值
已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y
已知2x-y/x+2y=3,求2(2x-y)/x+2y-9(x+2y)/2x-y+3的值.
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
已知x+y分之x-y=2,求2x+2y分之x-y-3x-3y分之2x+2y的值
当2x-y/x+y=3时,求代数式2x-y/2x+2y+x+y/6x-3y的值.
已知2x-y/x+3y=2,求代数式4x-2y/x+3y减4x+12y/2x-y的值
已知x+y分之x-y=2 求x+y分之3x-3y 减x-y分之2(x+y)的值
x+y分之x-y=2 求x+y分之3x-3y -x-y分之2(x+y)的值
若x-y/x+y=5,求x-y/2x+2y+5x+5y/3x-3y的值
已知x-y除以x+y=3,求代数式x+y分之2(x-y)-3(x-y)分之x+y的值.
已知x-y/x+y=2,求代数式2(x-y)/x+y + x+y/3(x-y)的值 快啊.
已知x,y的值满足方程组x+2y=3,x-y=-2,求x/(x-y)²+x²-y²/(x+