7×a-2×3×b = ? 2×3-2×a×b = ? 7×a-2×a = ? 7×a-5×b = ? 6×z-3×2×z = ? Merci d'avance.

Bonsoir,

7×a-2×3×b = 7a - 6b

2×3-2×a×b = 6 - 2ab

7×a-2×a = 7a - 2a = 5a

7×a-5×b = 7a - 5b

6×z-3×2×z = - 6z - 6z = 0z

Bonsoir,

7xa-2x3xb = 7a-6xb = 7a-6b

2x3-2xaxb = 6-2axb = 6-2ab

7xa-2xa = 7a-2a = 5a

7xa-5xb = 7a-5b

6xz-3x2xz = 6z-6xz = 6z-6z = 0z

PS : x = le signe multiplier