已知4x-3y=7,3x+2y=19,则14x-2y=?
已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
已知4x-3y=7,3x+2y=19,则14x-2y=?
已知实数x.y满足根号(x+y-8)+根号(8-x-y)=根号(3x-y-4)+根号(x-2y+7),求x,y
已知x-2y/2x+3y=3/4,则x:y=
已知{3x+2y=3 2x+3y=7 ,则x+y= ,x-y=
已知X和Y满足3X+4Y=2,X-Y-1/7
已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
已知4x²y-3y²=7,3x²y+4y²=19,求11x²y-2y&
已知2x-y/x+3y=2,求代数式4x-2y/x+3y减4x+12y除以2x-y
已知2x-y/x+3y=2,求代数式4x-2y/x+3y减4x+12y/2x-y的值