Répondre :
A=2-7^2x(5 x 3^2-46)^19
= 2 - 49 x ( 5 x 9 - 46 )^19
= 2 - 49 x ( 45 - 46 )^19
= 2 - 49 x (-1)^19
= 2 - 49 x (-1)
= 2 + 49
= 51
= 2 - 49 x ( 5 x 9 - 46 )^19
= 2 - 49 x ( 45 - 46 )^19
= 2 - 49 x (-1)^19
= 2 - 49 x (-1)
= 2 + 49
= 51