bonjour
a) [ 2 + ( - 2) ⁴ x 3 ] : ( 3 ² - 4)
= ( 2 + 48) : 5 = 50 : 5 = 10 = H
b) 8 x ( - 4) - ( 12 * - 5) : 6 ) + 29
= - 32 - ( - 60 : 6) + 29
= - 32 + 10 + 29 = 7 = E
c) = 5.6 * 10 ⁶ sur 4 * 10 ⁵ = 1.4 * 10 = 14 = L
d) 15 ⁶ * 18 ⁻⁵ sur 15 ⁶ * 18 ⁻⁶
15 ⁰ * 18 = 1 * 18 = 18 = P