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Sagot :

Bonsoir,

A = (+4) + (+9) = 4 + 9 = 13

B = (-7) + (-3) = -7 - 3 = -10

C = (+8) + (-2) = 8 - 2 = 6

D = (-23) + (+17) = -23 + 17 = -6

E = (+7.2) + (-7.2) = 7.2 - 7.2 = 0

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