若3^x=4,3^y=5,求3^4x+2y+1-(3^x+2y)^2的值
若x^5+x^4y+x^4+x+y+1=0,且3x+2y=1,求x,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)+...-(
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3x-4y/2x+y=1/2 求x/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=-1/4,能否确定代数式(2x-y)(2x+y)+(2x-y)(y-4x)+2y(y-3x)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.
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-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
若1/x-1/y=3,求5x+2xy-5y/x-4xy-y的值