Developper puis reduire chaque expression : 1/ A :-3(2c-5)-(4-c) 2/ A: 7-(8c+3)+2c(5c+4) B: 6c(2c-3)-(c+2)+4(5-3c²) C : -4c(2+3c)+(7c²-3c+1)+3(-2c+5)
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Developper puis reduire chaque expression : 1/ A :-3(2c-5)-(4-c) 2/ A: 7-(8c+3)+2c(5c+4) B: 6c(2c-3)-(c+2)+4(5-3c²) C : -4c(2+3c)+(7c²-3c+1)+3(-2c+5)
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1/ A :-3(2c-5)-(4-c)
= -6c + 15 - 4 + c
= -5c + 11
2/ A: 7-(8c+3)+2c(5c+4)
= 7 -8c - 3 + 10c² + 8c
= 10c² + 4
B: 6c(2c-3)-(c+2)+4(5-3c²)
= 12c² - 18c - c - 2 + 20 - 12c²
= -19c + 18
C : -4c(2+3c)+(7c²-3c+1)+3(-2c+5)
= -8c - 12c² + 7c² - 3c + 1 - 6c + 15
= -5c² -17c + 16
En espérant t'avoir aidé.