Bonjour
Il suffit simplement d’appliquer l’une ou l’autre des méthodes expliquées :)
37 + 9 = 37 + (10 - 1) = 37 + 10 - 1 = 47 - 1 = 46
48 + 98 = 48 + (100 - 2) = 48 + 100 - 2 = 148 - 2 = 146
125 + 99 = 125 + (100 - 1) = 125 + 100 - 1 = 225 - 1 = 224
2136 - 999 = 2136 - (1000 - 1) = 2136 - 1000 + 1 = 1136 + 1 = 1137
107 + 49 = 107 + (50 - 1) = 107 + 50 - 1 = 157 - 1 = 156
34 + 28 = 34 + (30 - 2) = 34 + 30 - 2 = 64 - 2 = 62
105 - 38 = (100 + 5) - (40 - 2) = 100 + 5 - 40 + 2 = 100 - 40 + 5 + 2 = 60 + 7 = 67
48 - 9 = 48 - (10 - 1) = 48 - 10 + 1 = 38 + 1 = 39
277 + 998 = 277 + (1000 - 2) = 277 + 1000 - 2 = 1277 - 2 = 1275
125 - 18 = 125 - (20 - 2) = 125 - 20 + 2 = 105 +
2 = 107
63 + 39 = 63 + (40 - 1) = 63 + 40 - 1 = 103 - 1 = 102
300 - 78 = 300 - (80 - 2) = 300 - 80 + 2 = 220 + 2 = 222
