CORRIGE : PUISSANCE niveau II (5) d '
opérations simples :les puissances de dix
Pour
chaque cas remplacer
x = 10 ;
n = 3 ; p = 2 .et faire les transformation des
expressions suivantes:
|
résultat |
|
= |
= = x -p |
= 10 -3 |
x n
x p = |
10 3
10 2 = 10 3+2 |
= 10 5 |
X n
Y n = |
X n
Y n = ( X Y ) n |
3 3 2 3 = ( 3 2) 3 ( 3 2 ) 3
= ( 31 21 )
( 32 22 ) ( 33
23 ) =( 33
23 ) |
= xp |
= 102 |
= 102 |
( X n )p = |
( 10 3 )2 = 1032 |
= 106 |
X np = |
1032 = ( 10 3 )2 |
= 10 6 |
x n+p
= x n x p |
10 3+2 = 10 3 10 2 |
= 10 5 |
= |
= x n-p |
= 10 2-3 =101 |
x
-p = |
x
-p = |
10 -3 = |
X n-p = |
X n-p = |
102-3 = |
*
== 10(+2) 10 (-3) =
10(-1) ; = 10(+2) -(+3)
=10(+2) +(-3) =10(-1)
I ) CALCULER SOS cours
10 3 = 1000 |
(+1)10 = 1 |
(-1)7 =
-1 |
(-3)3 = - 27 |
10-5 = 0,00001 |
(-1)12 = +1 |
(+2)-2 = 0,25 |
()-1 = - 1,142857 |
()3 = 0,125 |
()2 =
-0,44444444 |
()-2 = 1,7777778 |
()0 = - 1 |
II) Ecrire
plus simplement:
(5a)2 (2a2)3
=25a28a6 = 200a8 |
a5 : a7 = a-2 |
3a45a-2 =15 a6 |
a-3 : a-5
= a8 |
14 a 2 b3 : 49 a3 b2
= |
=109 |
=103 |
(2ab)3 (3b)2 = 8a3b39b4 =72a3b7 |
III)
Ecrire sous forme décimale : SOS cours
375 10-5 = 0,00375 |
21102 = 2100 |
3,410-3 = 0,0034 |
0,04104 = 400 |
2100010-2 = 210 |
|
|
|
= - 0,005 |
|
= 200 |
|