EXO 3 ET 4 SVP URGEENT POUR DEMAIN

bonjour

AG = x - 1
AE =  x - 3

aire AEFG = (x -1) ( x - 3) = x² - 3 x - x + 3 = x² - 4 x + 3

pour x = √5
S = (√5)² - 4√5 + 3 
S = 5 - 4√5 + 3
S = 8 - 4√5

a = 2/5 - 1.2
a = 2/5 - 6/5 = - 4/5

b = 3/5 : 7 = 3/5 x 1/7 = 3/35 

c = 2 - 12/21 = 42/21 - 12/21 = 30/21 = 10/7

d = 5 x 10⁻² + 0.07 x 10³
d = 0.05 + 70 = 70.05

e = 18 x 10 ⁻⁴ x 10 ³ sur 30 x 10 ⁻³
e = 18 x 10 ⁻¹ sur 30 x 10 ⁻³
e = 0.6 x 10 ²