若2x-y=3,试求-5-4x+2y的值
若x-y/x+y=5,求x-y/2x+2y+5x+5y/3x-3y的值
若x^5+x^4y+x^4+x+y+1=0,且3x+2y=1,求x,y的值
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.
若x、y、z满足2x+3y+z=18,4x-3y+5y=24,求x+3y的值.
已知x::y:z=3:4:5,(1)求x+y分之z的值;(2)若x+y+z=6,求x,y,z.
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.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
已知x^3+xy^2+x+x^2y+y^3+y=0,求5x-6y/3x+4y的值.
若|3x+2y-4|+|3y-2x+5|=0,求x+y的值
若x/3=y/4=z/5,求x+y+z/3x-2y+z的值.