若X*Y=(X+3)×5-2Y,求2*9的值
若x-y/x+y=5,求x-y/2x+2y+5x+5y/3x-3y的值
已知2x-y/x+2y=3,求2(2x-y)/x+2y-9(x+2y)/2x-y+3的值.
已知X.x+y.y-4x+2y+5=0,求4X.X-12X Y+9Y.y的值
(1)已知x+y=6,x²-y²=5,求x-y的值(2)若x+y=3,x²+y²
若x^5+x^4y+x^4+x+y+1=0,且3x+2y=1,求x,y的值
3x=2y+1;x=9y;求x,y的值?
已知3x-2y/x+y=5/3求x;y的值
若X,Y互为相反数,且(X+Y+3)(X-Y-2)=0,求X,Y的值?
若x、y满足2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
若x、y、z满足2x+3y+z=18,4x-3y+5y=24,求x+3y的值.
1.已知:x-2y=3,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除4x 的值