bonjour
A = fraction simple, je ne fais pas, tu es en 4ème ou 3ème
B = 60 x 10 ⁻⁴ sur 3 x 10 ⁻⁶ = 20 x 10 ² = 2 x 10 ³
C = ( -1) x 4 ⁵ x 4 ² - 3 x ( 4⁵)³
= - 1 x 4 ³ - 3 x 4¹⁵
= - 1000 - 3 221 225 472
= 3 221 224 472
a) 5 x - 25 = 0
5 x = 25
x = 5
b) 3 x + 1 = 7
3 x = 7 - 1
3 x = 6
x = 2
c) 7 x + 13 = - 2
7 x = - 2 - 13
7 x = - 15
x = - 15/7
d) 4 x - 3 = 0
4 x = 3
x = 3/4
a) 3 x = 2 x + 5
3 x - 2 x = 5
x = 5
b) 4 - 5 x = 9 x
- 5 x - 9 x = - 4
- 14 x = - 4
x = 4/14 = 2/7
c) 4 x + 2 = x + 11
4 x - x = 11 - 2
3 x = 9
x = 9/3 = 3
d) 3 x - 7 = - 2 x - 9
3 x + 2 x = - 9 + 7
5 x = - 2
x = - 2/5
