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Sagot :

AYUDA

bjr

2h 45 min = 2h + 45/60 h = 2,75h

x - y si x = 2 et y = -3

= 2 - (-3) = 2 + 3 = 5

42/70 = 7 x 6 / 7 x 10 = 6/10 = 2x3 / 2x5 = 3/5

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