ecrire le plus simplement possible C = 3 x (2 x a + b) X 5 // D = (2.5-1) x a x b

bonjour
C=3×(2a+b)×5
=3×5(2a+b)
=15×2a+15×b
=30a+15b

D=1,5×a×b
=1,5ab
ou
2,5ab-ab=1,5ab

bonjour

C= 3×(2×a+b)×5
C=15(2a+b)
C=30a+15b

D=(2,5-1)×a×b
D=1,5ab