先利用换底公式:
log9 2=log3 2/log3 9=log3 2/2
log8 3=log2 3/log2 8=log2 3/3
log4 3=log2 3/log2 4=log2 3/2
(log3 2+log9 2)×(log4 3+log8 3)
=3/2×log3 2×5/6×log2 3
因为log2 3和log3 2互为倒数
所以结果为3/2×5/6=5/4
先利用换底公式:
log9 2=log3 2/log3 9=log3 2/2
log8 3=log2 3/log2 8=log2 3/3
log4 3=log2 3/log2 4=log2 3/2
(log3 2+log9 2)×(log4 3+log8 3)
=3/2×log3 2×5/6×log2 3
因为log2 3和log3 2互为倒数
所以结果为3/2×5/6=5/4