About Lesson
17.2 Logarithm 对数
1. Simplify 化简
(a)
![Rendered by QuickLaTeX.com {log}_3{\sqrt[3]{81\sqrt[4]{729\times9^{2/3}}}}](https://learn-ondemand.com/wp-content/ql-cache/quicklatex.com-b3ace1a1ea23e992a25b265b72ddda47_l3.png)
(b) –
+
(c) log25 + log2log50 + (log2)
Answer:
(a)

(b) 0
(c) 2
2.
If a + b
= 14ab, prove that
=
若a2 + b2 = 14ab, 试证 =
3.
Given that 2 = 9
= 125
= 120, prove that
+
+
=1
已知2 = 9
= 125
= 120, 试证
+
+
=1
4.
Given that a, b, c are positive and 3 = 4
= 6
, prove that
=
+
.
已知 a, b, c 是正值且 3 = 4
= 6
, 试证
=
+
.