y(x-3)=2x
yx-3y=2x
(y-2)x=2y
x=3y/(y-2)
所以反函数是y=3x/(x-2),x≠2
log4(x)=lgx/lg4
=lgx/2lg2
=lgx^(1/2)/lg2
=log2(√x)
f(log以4为底的X)
=2^log2(√x)-2=1/5
√x=11/5
x=121/25
y(x-3)=2x
yx-3y=2x
(y-2)x=2y
x=3y/(y-2)
所以反函数是y=3x/(x-2),x≠2
log4(x)=lgx/lg4
=lgx/2lg2
=lgx^(1/2)/lg2
=log2(√x)
f(log以4为底的X)
=2^log2(√x)-2=1/5
√x=11/5
x=121/25