∵log(y²)x=log(x²)(y²)/log(x²)x=2log(x²)(y²)=log(x²)(y⁴)
∴log(x²)y+log(x²)(y⁴)=1
∴log(x²)(y⁴y)=1
∴x²=y⁴y
∴y=x^(2/5)（即x的2/5次方）