試將下列各指數式寫成對數式

(1)\;2^3=8

(2)\;3^5=243

(3)\;5^{-1}=\frac{1}{5}

(4)\;9^{\frac{3}{2}}=27

⇒log_28=3

⇒log_3{243}=5

⇒log_5{\frac{1}{5}}=-1

⇒log_9{27}=\frac{3}{2}

計算或化簡下列各對數值

(1)\;log_232

=log_2{2^5}

=5

(2)\;log_31

=log_3{3^0}

=0

(3)\;log_3{\frac{1}{729}}

=log_3{3^{-6}}

=-6

(4)\;log_2\left( \frac{1}{32}  \right) ³

=log_2{(2^{-5})³}

=log_22^{-15}

=-15

Forward

 對數的計算

A = (-1.0847952259449, 5.893083606178415)
s = 0 (slider from 0 to 23, step 1)