Bonjour,
A=
on simplifie
5/3 *2/3= 10/9
B=
-21/2 *-3/56 = 63/112 = 9/16
C=
-49/63 * -9/28 = -49/7 * -1/28 = 49/196 = 7/28
exercice 102
3/4h = 45mn
1/3 de 45
(1*45)/3 => 15mn au jacuzzi
Il a nagé:
45 -15 => 30mn
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Bonjour,
A=
on simplifie
5/3 *2/3= 10/9
B=
-21/2 *-3/56 = 63/112 = 9/16
C=
-49/63 * -9/28 = -49/7 * -1/28 = 49/196 = 7/28
exercice 102
3/4h = 45mn
1/3 de 45
(1*45)/3 => 15mn au jacuzzi
Il a nagé:
45 -15 => 30mn