Réponse :
EX1
Compléter les égalités suivantes
2⁵ x 2² = 2⁷
(-7)⁻⁸ x (- 7)⁵ = (-7)⁻³
11 ⁻⁷ x 11⁻² = 11⁻⁹
3⁻² x 3⁴ = 3²
4⁻³ x 4³ = 1
6⁻⁷ x 6⁸ = 6
3⁵/3³ = 3²
(-9)⁻⁸/(-9)⁻³ = (-9)⁻⁵
7⁻⁵/7³ = 7⁻⁸
5⁴/5⁷ = 5⁻³
(7²)⁴ = 7⁸
((- 3)²)⁻⁵ = (- 3)⁻¹⁰
(6⁻¹)⁵ = 6⁻⁵
(8³)⁵ = 8¹⁵
((- 4)³)⁻⁴ = (- 4)⁻¹²
(9⁰)⁷ = 1
(3 x)² = 3² x² = 9 x²
(- 4 z)³ = - 64 z³
(- 2 y)⁴ = (-2)⁴ y⁴ = 16 y⁴
(x/5)² = x²/5² = x²/25
(z/5)³ = z³/125
(- 2 y/3)³ = - 8 y³/27
EX2
1) prouver par des calculs que F = 5/3
F = [35 x 10²² x 2 x (10⁻²)⁶]/42 x 10¹⁰
= (35 x 2 x 10¹⁰ x 10¹² x 10⁻¹²)/42 x 10¹⁰
= (35 x 2 x 10¹² x 10⁻¹²)/42
= 5 x 7 x 2/2 x 3 x 7 = 5/3
2) écriture scientifique de G
G = 8 x 10⁻⁵ x 14 x (10²)³/7 x 10⁴
= 8 x 2 x 7 x 10⁻⁵ x 10⁶/7 x 10⁴
= 16 x 10 x 10⁻⁴ = 16 x 10⁻³ = 1.6 x 10⁻²
G = 1.6 x 10⁻²
Explications étape par étape
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Réponse :
EX1
Compléter les égalités suivantes
2⁵ x 2² = 2⁷
(-7)⁻⁸ x (- 7)⁵ = (-7)⁻³
11 ⁻⁷ x 11⁻² = 11⁻⁹
3⁻² x 3⁴ = 3²
4⁻³ x 4³ = 1
6⁻⁷ x 6⁸ = 6
3⁵/3³ = 3²
(-9)⁻⁸/(-9)⁻³ = (-9)⁻⁵
7⁻⁵/7³ = 7⁻⁸
5⁴/5⁷ = 5⁻³
(7²)⁴ = 7⁸
((- 3)²)⁻⁵ = (- 3)⁻¹⁰
(6⁻¹)⁵ = 6⁻⁵
(8³)⁵ = 8¹⁵
((- 4)³)⁻⁴ = (- 4)⁻¹²
(9⁰)⁷ = 1
(3 x)² = 3² x² = 9 x²
(- 4 z)³ = - 64 z³
(- 2 y)⁴ = (-2)⁴ y⁴ = 16 y⁴
(x/5)² = x²/5² = x²/25
(z/5)³ = z³/125
(- 2 y/3)³ = - 8 y³/27
EX2
1) prouver par des calculs que F = 5/3
F = [35 x 10²² x 2 x (10⁻²)⁶]/42 x 10¹⁰
= (35 x 2 x 10¹⁰ x 10¹² x 10⁻¹²)/42 x 10¹⁰
= (35 x 2 x 10¹² x 10⁻¹²)/42
= 5 x 7 x 2/2 x 3 x 7 = 5/3
2) écriture scientifique de G
G = 8 x 10⁻⁵ x 14 x (10²)³/7 x 10⁴
= 8 x 2 x 7 x 10⁻⁵ x 10⁶/7 x 10⁴
= 16 x 10 x 10⁻⁴ = 16 x 10⁻³ = 1.6 x 10⁻²
G = 1.6 x 10⁻²
Explications étape par étape