June 2021 0 129 Report
Supprimer les parentheses, puis reduire. A= 3a + 5 - (2a + 7) + (8 - 5a)
B= -b + 4 + (3b - 2) - (8b - 5)
C= 6 - 5c + 3c - (4 - 6c) + 5 + (7 - 2c)
D= d - 1 - (3d + 4) + (5 - 4d) - (7d + 5) +5
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