Potęgowanie to skrócony zapis mnożenia.
a n = n razy a ⋅ a ⋅ … ⋅ a
gdzie a jest dowolną liczbą rzeczywistą, zaś n - dowolną liczbą naturalną większą od 1 .
Przy mnożeniu liczb dziesiętnych przez liczby typu 10 , 100 , 1000 itd. przesuwamy przecinek w prawo o tyle miejsc, ile zer ma na końcu liczba 10 , 100 , 1000 itd.
a)
3 , 2 ⋅ 10 6 = 3 , 2 ⋅ 10 ⋅ 10 ⋅ 10 ⋅ 10 ⋅ 10 ⋅ 10 = 3 , 2 ⋅ 1000000 = 3200000
3 , 5 ⋅ 10 6 = 3 , 5 ⋅ 10 ⋅ 10 ⋅ 10 ⋅ 10 ⋅ 10 ⋅ 10 = 3 , 5 ⋅ 1000000 = 3500000
3 , 2 ⋅ 10 6 < 3 , 5 ⋅ 10 6
Odp: 3 , 5 ⋅ 10 6
b)
4 , 3 ⋅ 10 5 = 4 , 3 ⋅ 10 ⋅ 10 ⋅ 10 ⋅ 10 ⋅ 10 = 4 , 3 ⋅ 100000 = 430000
10 6 = 10 ⋅ 10 ⋅ 10 ⋅ 10 ⋅ 10 ⋅ 10 = 1000000
4 , 3 ⋅ 10 5 < 10 6
Odp: 10 6
c)
6 , 25 ⋅ 10 8 = 6 , 25 ⋅ 10 ⋅ 10 ⋅ 10 ⋅ 10 ⋅ 10 ⋅ 10 ⋅ 10 ⋅ 10 = 6 , 25 ⋅ 100000000 = 625000000
6 , 44 ⋅ 10 7 = 6 , 44 ⋅ 10 ⋅ 10 ⋅ 10 ⋅ 10 ⋅ 10 ⋅ 10 ⋅ 10 = 6 , 44 ⋅ 10000000 = 64400000
6 , 25 ⋅ 10 8 > 6 , 44 ⋅ 10 7
Odp: 6 , 25 ⋅ 10 8
d)
5 , 85 ⋅ 10 3 = 5 , 85 ⋅ 10 ⋅ 10 ⋅ 10 = 5 , 85 ⋅ 1000 = 5850
62 , 5 ⋅ 10 2 = 62 , 5 ⋅ 10 ⋅ 10 = 62 , 5 ⋅ 100 = 6250
5 , 85 ⋅ 10 3 < 62 , 5 ⋅ 10 2
Odp: 62 , 5 ⋅ 10 2
e)
37 , 25 ⋅ 10 4 = 37 , 25 ⋅ 10 ⋅ 10 ⋅ 10 ⋅ 10 = 37 , 25 ⋅ 10000 = 372500
6 , 1 ⋅ 10 6 = 6 , 1 ⋅ 10 ⋅ 10 ⋅ 10 ⋅ 10 ⋅ 10 ⋅ 10 = 6 , 1 ⋅ 1000000 = 6100000
37 , 25 ⋅ 10 4 < 6 , 1 ⋅ 10 6
Odp: 6 , 1 ⋅ 10 6
f)
0 , 003 ⋅ 10 9 = 0 , 003 ⋅ 10 ⋅ 10 ⋅ 10 ⋅ 10 ⋅ 10 ⋅ 10 ⋅ 10 ⋅ 10 ⋅ 10 = 0 , 003 ⋅ 1000000000 = 3000000
3 ⋅ 10 7 = 3 ⋅ 10 ⋅ 10 ⋅ 10 ⋅ 10 ⋅ 10 ⋅ 10 ⋅ 10 = 3 ⋅ 10000000 = 30000000
0 , 003 ⋅ 10 9 < 3 ⋅ 10 7
Odp: 3 ⋅ 10 7