(log3 4 + log9 2)(log2 9 + log4 9) https://www.wolframalpha.com/input?i=%28log3+4+%2B+log9+2%29%28log2+9+%2B+log4+9%29+&lang=ja
(log3 4 + log9 2)(log2 9 + log4 9)
https://www.wolframalpha.com/input?i=%28log3+4+%2B+log9+2%29%28log2+9+%2B+log4+9%29+&lang=ja