bonjour
I ) A = 15 - 0.009 sur 300 = 14.991 /300 = 0.04997 = 4.997 x 10 ⁻²
B = 168 x 10 ⁻⁵ sur 14 x 10 ⁻³ = 12 x 10 ⁻² = 1.2 x 10 ⁻¹
II ) 10 ⁵ + 10 ⁻⁵ = 100 000 + 0,00001 = 100 000 ,00001
10 ¹⁷ + 3 sur 10 ¹⁷ = 1 x 10 ¹⁷ sur 10 ¹⁷ = 1 x 10 ⁰ = 1
III
a = 2 x² + 2 x + 5 x + 5 = 2 x² + 7 x + 5
b = 4 t² - 8 t - 6 t + 12 = 4 t² - 14 t + 12
c = 4 x² - 20 x + 25
d = x² - 9
IV
1 ) 5 x + 15 = 5 ( x + 3 )
2) 7 y² - 2 y = y ( 7 y - 2)
V
a) x² - 4 x + 4 = ( x - 2)²
b) 4 t² - 16 t = 4 t ( t - 4 )
