Réponse :
a) E = (3 a + 4b-5c)-(2 a-b+2 c) + (2b+9 c)
E = 3a + 4b - 5c - 2a + b - 2c + 2b + 9c
E = a + 7b + 2c
b) si a = 17, b=-3, c = 1, alors :
E = 17 + 7 × ( - 3 ) + 2 × 1
E = 17 - 21 + 2
E = - 2
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Réponse :
a) E = (3 a + 4b-5c)-(2 a-b+2 c) + (2b+9 c)
E = 3a + 4b - 5c - 2a + b - 2c + 2b + 9c
E = a + 7b + 2c
b) si a = 17, b=-3, c = 1, alors :
E = a + 7b + 2c
E = 17 + 7 × ( - 3 ) + 2 × 1
E = 17 - 21 + 2
E = - 2