bonsoir
84 = 2 ² x 3 x 7
128 = 2 ⁷
donc PGCD = 4
tu simplifies par 4
56/24 x 36/49 = 12/7
A = 7/5 - 7/5 : ( 3/2 + 2 )
= 7/5 - 7/5 : ( 3/2 + 4/2 )
= 7/5 - 7/5 : 5/2
= 7/5 - 7/5 x 2 /5
= 7/5 - 14 /25
= 35/25 - 14 /25
= 21/25
B = - 3 + 3 ² x 5 - ( - 6 ) - 2 ³ x 6
= - 3 + 45 + 6 - 8 x 6
= - 3 + 51 - 48
= 0
A ≠ B
6 x 10 ¹² x 35 x 10 ⁻⁴ : 14 x 10 ³
= 210 x 10 ⁸ : 14 x 10 ³
= 15 x 10 ⁵
= 1.5 x 10 ⁶
