bjr
ex 25
(+2) + (-7) = 2 - 7 = - 5
(-4) + (-5) = -4 - 5 = -9
(-8) + (+14) = - 8 + 14 = + 6
(+9) + (+9) = 9+9 = 18
question 5 et 6 duquel ???
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bjr
ex 25
(+2) + (-7) = 2 - 7 = - 5
(-4) + (-5) = -4 - 5 = -9
(-8) + (+14) = - 8 + 14 = + 6
(+9) + (+9) = 9+9 = 18
question 5 et 6 duquel ???