已知4[1-2(x+y)]+2[-(x+y)-5]=-14(x+y),求3x+3y的值.
已知3x-4y/2x+y=1/2 求x/y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=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(
1.已知:x-2y=3,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除4x 的值
已知x-2y=2011,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]÷4x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3x-2y/x+y=5/3求x;y的值
已知4x-2y=0,求x-y/3x+2y的值
已知|2x-3y|+|3x-y-1|=0,求x,y的值.
已知x/y=3/4,求2x-y/x+y的值.
已知4[1-2(x+y)]+2[-(x+y)-5]=-14(x+y),求3x+3y的值.用一元一次方程解,谢谢...
已知1/x+1/y=5,求(2x-3y+2y)/(x+2xy+y)的值