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Ramkoo
@Ramkoo
April 2019
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AIDEZ MOI SVP !!!!
Sachant que a = 2/21 et b = 5/7. Tu donneras les résultats sous forme de fraction irréductibles.
1) Calculer a/b et a x b.
2) Calculer a = b et a -b.
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Verified answer
1) Calculer a/b et a x b.
a/b=(2/21)/(5/7)=2/21*7/5=14/105=2/15
ab=2/21*5/7=10/147
2) Calculer a = b et a -b.
a+b=2/21+5/7=2/21+15/21=17/21
a-b)2/21-5/7=2/21-15/21=-13/21
2 votes
Thanks 4
Ramkoo
Merci
maudmarine
Sachant que a = 2/21 et b = 5/7. Tu donneras les résultats sous forme de fraction irréductibles.
1)
Calculer a/b et a x b.
a/b = 2/21 : 5/7 = 2/21 x 7/5 = 14/105 = 7 x 2 / 7 x 15 =
2/15
a x b = 2/21 x 5/7 =
10/147
2)
Calculer a = b et a -b.
a + b = 2/21 + 5/7 = 2/21 + 5 x 3 / 7 x 3 = 2/21 + 15/21 =
17/21
a - b = 2/21 - 5/7 = 2/21 - 15/21 = - 12/21 = 3 x - 4 / 3 x 7 =
- 4/7
2 votes
Thanks 2
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Verified answer
1) Calculer a/b et a x b.a/b=(2/21)/(5/7)=2/21*7/5=14/105=2/15
ab=2/21*5/7=10/147
2) Calculer a = b et a -b.
a+b=2/21+5/7=2/21+15/21=17/21
a-b)2/21-5/7=2/21-15/21=-13/21
1) Calculer a/b et a x b.
a/b = 2/21 : 5/7 = 2/21 x 7/5 = 14/105 = 7 x 2 / 7 x 15 = 2/15
a x b = 2/21 x 5/7 = 10/147
2) Calculer a = b et a -b.
a + b = 2/21 + 5/7 = 2/21 + 5 x 3 / 7 x 3 = 2/21 + 15/21 = 17/21
a - b = 2/21 - 5/7 = 2/21 - 15/21 = - 12/21 = 3 x - 4 / 3 x 7 = - 4/7