f(x1^2)+f(x2^2)=loga x1^2 +loga x2^2
=2loga x1 + 2loga x2
=2(loga x1 + loga x2)
=2(f(x1)+f(x2))
=2
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用到这个就可以了
loga^N b^M=M/N loga
f(x1^2)+f(x2^2)=loga x1^2 +loga x2^2
=2loga x1 + 2loga x2
=2(loga x1 + loga x2)
=2(f(x1)+f(x2))
=2
---------------------------------------
用到这个就可以了
loga^N b^M=M/N loga