Sagot :
Bonjour
1. 0.009 64 x 10 ⁻⁷ = 9.64 x 10 ⁻³ x 10 ⁻⁷ = 9.64 x 10 ⁻¹⁰
2. 3 x - 4 = 7 x + 4
3 x - 7 x = 4 + 4
- 4 x = 8
x = - 2
3. 27/15 - 4/5 : 2/3 = 27/15 - 4/5 x 3/2 = 27/15 - 12/10 = 54/30 - 36/30 = 18/30 = 3/5
4. 11 ⁻⁶ * 11 ¹⁰ : 11 ⁻⁷ = 11 ⁴ / 11 ⁻⁷ = 11 ¹¹
Bonjour,
0,00964 = 9,64 × 10⁻³
donc : 0,00964 × 10⁻⁷ = 9,64 × 10⁻³ × 10⁻⁷
= 9,64 × 10⁻³⁺⁽⁻⁷⁾
= 9,64 × 10⁻¹⁰
3x - 4 = 7x + 4 ⇒ 3x - 7x = 4 + 4
⇒ -4x = 8
⇒ x = -8/4 = -2
27/15 - 4/5 ÷ 2/3 = 27/15 - 4/5 × 3/2
= 27/15 - 12/10
= 54/30 - 36/30
= 18/30
= 9/15
((11²)⁻³ × 11¹⁰)/(11² × 11⁻⁹) = (11²ˣ⁽⁻³⁾⁺¹⁰)/(11²⁺⁽⁻⁹⁾)
= 11⁴ / 11⁻⁷
= 11⁴⁻⁽⁻⁷⁾
= 11¹¹