bonjour
A = 2/3 + 1 /3 x 2 /5
A = 2/3 + 2/15
A = 10/15 + 2/15 = 12 /15
A = 4/3
B = ( 1/2 - 2 /5 ) + ( 2/3 + 1 /5 )
B = ( 5/10 - 4 /10 ) + ( 10/15 + 3/15 )
B = 1/10 + 13/15
B = 3/30 + 26 /30
B = 29/30
C = 10 ³ x 10 ⁻⁴ x 10 ⁶ x 10 ⁶
C = 10 ¹¹ = 1 x 10 ¹¹
d = 10 ³ / 10 ⁻²
d = 10 ⁵ = 1 x 10 ⁵
E = 2 n ² - 2 n + 3
pour n = 2
E = 8 - 4 + 3 = 7
fais pour n = - 2
F = ( 2 n + 5 )² - 4 n
pour n = 2 /3
( 2 *2/3 + 5 ) ² - 4 * 2/3
= ( 4/3 + 5 )² - 8 /3
= ( 4/3 + 15/3 )² - 8/3
= ( 19/3 )² - 8 /3
= 361/9 - 24/9
= 337/9
