2 Pose et effectue les opérations suivantes. ● • 12 min 28 s + 47 min = 58 min 2.8. S • 17 h 43 min + 3 h 45 min ...h................ min • 29 min 14 s-53 s= . 4 h 03 min - 53 min h................ min ......... S mins​
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