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Sagot :

Bonsoir

a/  -9) - (-3) - (+7)    = -9 +3 -7 = - 13
b/  (-15) + ( -24) - (+17) - (-21) = -15 -24 -17 +21 = - 35

(-9) - (-3) - (+7)   
= -9+3-7
= -13  

(-15) + ( -24) - (+17) - (-21)
= -15-24-17+21
= -35

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