已知xy>0且x≠y,求证:log(x^4+6x^2y^2+y^4)>log(4xy(x^2+y^2))
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
已知x-y=4xy且xy≠0,求代数式-x-2xy+y分之2x+3xy-2y的值
已知log(2)[log(3)(log(4) x)] = log(3) [log(4) (log(2) y)]=0,求x
(1)已知x-y=6,xy=4,求xy^-1+x^-1y的值; (2)已知x^2+y^2=3xy且xy≠0,求x^2y^
已知3x^2+xy-2y^2=0,求{(x+y)/(x-y)+4xy/(y^2-x^2)}/{(x+3y)*(x-y)}
已知5x-4y=0且xy不等于0,求x^2+y^2/x^2-y^2-x+y/x-y的值
x^2y+4xy+4y
对数函数的最小值如题 已知X>0 Y大于等于0 且X+2Y=2分之一 求g=log以2分之一为底的(8XY+4Y方+1)
已知x,y>0 2x+y+3=xy 求5x+4y最小值
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
设x≥0,y≥0,则x+2y=1/2 ,那么z=log½(8xy+4y^2+1)的最大值?
已知x-y=4xy,则2x+3xy-2yx-2xy-y