bonjour
A = [2/3 * 5/4 - 3/2 ] : - 7/12
A = ( 10/12 - 18/12) : - 7/ 12
A = - 8/12 * - 12/7
A = 96/84 = 8/7
B = - 21/15 x ( 10/35 - 15/35)
B = - 21/15* - 5/35
B = 105/525 = 1/5
C = ( - x + 3 ) ( 2 a - 5)
= - 2 ax + 5 x + 6 a - 15
P = 2 ( 2 n + 3 n + 5)
= 4 n + 6 n + 10
= 10 n + 10
= 10 ( n + 1)
A = 2 n ( 3 n + 5) = 6 n² + 10 n = 2 n ( 3 n + 5)
