Présenter un calcul
On donne les expressions A = 3a (b-2c)
1. Sachant que a = -3; b= 8
2. Sachant que a = 4 ; b = -2
B=3 (5a-2b)
et c = -7 calculer chacune des expressions A et B
C=a²-4(c +b)
et c=5 calculer chacune des expressions B et C
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