问题
解答题
计算 (1)log
(2)( 8a
|
答案
(1)log
2+log927+2
log41 4
+21+log291 16
=2+
-3 2
+181 2
=21.(6分)
(2)( 8a
•- 5 6
)ab
•- 1 4 3 a2b 3 4 - 1 3
=( 8a
•- 5 6
)ab
•a- 1 4
b2 3 1 4
(8分)- 1 3
=( 8a
•- 5 6
)a 5 3 - 1 3
=( 8a
•a- 5 6
)5 6
(10分)- 1 3
=( 8 )
=(23)-- 1 3
=1 3
.(12分)1 2