Sagot :
bonjour,
1. 3/4 - 5 /4 * 1/2
= 3/4 - 5/8
= 24/32 - 15/32
= 9/32
2. R = 1/20 + 1/5
= 1/20 + 4/20 = 5/20 = 1/ 4
3. 87 500 000 = 8.75 * 10 ⁷
4. 0.246 = 2.46 * 10 ⁻¹
5. 10 ⁷ / 10 ⁻⁵ = 10 ¹²
6. 5 ⁻¹ = 1 /5
7. 2 x² + 3 x - 2 = 0
solution = - 2 , tu remplaces x par - 2
8. f (x) = 4 x - 5
f ( - 1) = 4 * - 1 - 5 = - 4 - 5 = - 9
9. g (x) = 3 x +2
3 x + 2 = - 7
3 x = - 7 - 2
3 x = - 9
x = - 3
10. h (x) = x² + 7
h ( -2 ) = 4 + 7 = 11
11. ( 2 x - 1 )² = 4 x² - 4 x + 1
12. identité remarquable comme 11 , tu fais
13. 6 x - 4 x + 8 = 2 x + 8