Sagot :
A = -15 - 4 x(-12) +5
= -15 -(-48) + 5
= -15 + 48 +5
= -15 + 53 = 38
B= a² + 5a - ab
= -4² + 5x(-4) - (-4) x 3
= 16 + (-20) - (-12)
= 16 -20 + 12
= 16 + 12 -20
= 28 - 20 = 8
bonjour
calculer en détaillant les étapes de calcul
A = -15 - 4 x(-12) +5
autre exercice
sachant que a = -4 et b =3 calculer B = a au carré + 5a -ab
A = -15 - 4 x(-12) +5
= -15 -(-48) + 5
= -15 + 48 +5
= -15 + 53 = 38
B= a² + 5a - ab
= -4² + 5x(-4) - (-4) x 3
= 16 + (-20) - (-12)
= 16 -20 + 12
= 16 + 12 -20
= 28 - 20 = 8