1. F 1
ก n
1. Fก F
1. ก n ก F F
2. Fก ก ก n ก F F
3. ก ก n F F
2.
Fn ก กก F 1 a b
b ก n aก F bn = a
3. ก F
ก n
ก กก ก ก F F ก n
a( F ก F na )
Fn ก กก F 1 a b
b ก n aก F bn = a
ก na F F ก ก n a ก F n a
ก F ก ก F ก ก n a na
1. F a = 0 , n a = 0
2. F a > 0 , n a
3. F a < 0 n na n F na F F
** F n=2 2a F a
F 1 2 ก 2 4 22 = 4
3 ก 3 27 33 = 27
-5 ก 3 -125 (-5)3 = -125
2 ก 5 32 25 = 32

2. ก n
ก n F
( 3 )2 = 3 ,
n 5
1. n a 




= a na 5 − 4  = − 4
 
 
2. n n
a = a a≥0 32 = 3 , 5 5
8 = 8
n n
a = a a<0 n 4 (−3) 4 = −3 = 3
ก 6 (−2) 6 = −2 = 2
n n
a = a a<0 n
F ก
3. n ab = n a •n b
32 = 16 • 2 = 16 • 2 = 4 2
3 250 = 3 (−125)(2) = 3 (−125) • 3 2 = − 53 2
F 2 F F F F F
1. 500 2. 125
3. 3 810 4. 6 ⋅ 15
1. 500 = 100 ⋅ 5 = 100 ⋅ 5 = 10 5
2. 125 = 25 ⋅ 5 = 25 ⋅ 5 = 5 5
3. 3 810 = 3 27 ⋅ 30 = 3 27 3 30 = 33 30