Supprimer les parenthèses,puis réduire chaque expressions .
A= 2a -(7+3a)+(3-5a)
B=(2a +3)-(1-3a)-(2a-7)+(2-7)
C=(4a+b)+(2-5b)-(3a-b)+(1-3a)
A= 2a -(7+3a)+(3-5a)
B=(2a +3)-(1-3a)-(2a-7)+(2-7)
C=(4a+b)+(2-5b)-(3a-b)+(1-3a)
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Verified answer
Bonsoira= 2 a - 7 - 3 a + 3 - 5 a = - 6 a - 4
b = 2 a +3 - 1 + 3 a - 2 a +7 + 2 - 7= 3 a + 2
c = 4 a +b +2 - 5 b - 3 a +b + 1 - 3 a = - 2a - 3 b + 3