108課綱
指數與對數回收
老師講解 求個問題(一)
(1) 設9*=7,求下列各值:
(a) 77 (b) ( 255
(a)27*
> (3*} = 73 7斤
(b) 34x-1
(c)3*+1 −7.3-*
学x34x
²x (3x)+
·3·(3/3)-7-(3x11
= 37 - 9 x
(2) 若4=3.8°=5・試求
(a)8°
(c) 3ā
= 4
=
(d) 5%
=
= x 49 = 号
=
² 37 - G = 27
(b)16+36
=169 +1636
249.
(1) 58 +1
(a) 3√3 (b)5625 (c)4 (d) 3√3 (e)8 (f) 15√3
f(2)*= 3 » 20 = 3+
①
S4=3*
| (2b)³=5 ⇒ 2b = 5¾ - . 28=55
②
= (291³
= (333 = 3 = JP = 33 f
Lagen 編製
= 5.5
井
快
(5b)a=8a=353
1)²
(e) | 3 +1
=(4+1)古
= 8
=5=
Tip:
= 5×33
=15√√3
121.40-76
② 3 x 3% = 3x+
③ X 3* = 3X4D
井
9x=7
9 (3²* = ( 3** = 7
尹 3× = 斤
xzb=(20)*x(26)-
12
= (3) x (53)2
=3x54
= 9x625 = 5625
學生練習
2a
=5,求下列各式的值:
(1)已知)
8-
(a)
405
(a) 98-2
:92x90
音x90
(b) 25x338。
=
(2) 若3 = 5.3° =7,試求
(a) 32a-1
(a) (b) (c)(d)3(e)5 (f)3
(b) √5
= 329-31
=
(b) 32a-b+1
(c) 9-ª
= 34-35+3'
= (39) ² - 7+3 =
(d) 5 =
(e) 7%
(3) = 53 店
(37)* = (a)片
3 = 95
=(76) ª
=
on(1²-2²
老師講解 求個
(1) 若26 = a·20
(a) ab (b) ab
(a) 20.63
(b)2-1.37
(3) 設 20.3 :
(取到小
(a) 21.38
類 設 (A) (D) (c)(D)(日)
類題
1
設24 =
ab
16
a¹
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