3x+4y=2 2x-y=5 求X与Y的解
求5x-2y=x-y=4x-3y-2的解
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
关于X,Y的方程组3X+2Y=2m+5与x-y=4m-5的解x,y满足x+2y
方程组:3y=x+4 ,2x+5y=-19 求x与y的值
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.
(3x+2y)+(5x-y)i=17-2i.求x与y
已知4份之3x+2y=6份x-y+1=5份之2x+y,求x与y的值
已知2x-y/x+3y=2,求代数式4x-2y/x+3y减4x+12y/2x-y的值
若x-y/x+y=5,求x-y/2x+2y+5x+5y/3x-3y的值
已知X.x+y.y-4x+2y+5=0,求4X.X-12X Y+9Y.y的值