问题
解答题
计算: (1)27
(2)log225•log34•log59. |
答案
(1)原式=33×
-3×log22-3+lg22+2lg5=9+9+2(lg2+lg5)=20.2 3
(2)原式=
•2lg5 lg2
•2lg2 lg3
=8.2lg3 lg5
计算: (1)27
(2)log225•log34•log59. |
(1)原式=33×
-3×log22-3+lg22+2lg5=9+9+2(lg2+lg5)=20.2 3
(2)原式=
•2lg5 lg2
•2lg2 lg3
=8.2lg3 lg5