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lolita9711
@lolita9711
January 2021
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AIDER MOI POUR LE 53
il faut calculer sous forme fractionnaire et simplifié si possible
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maudmarine
Verified answer
Bonjour,
a. 3/8 - (7/3 - 3/4)
= 3 x 3 / 8 x 3 - (7 x 8 / 3 x 8 - 3 x 6 / 4 x 6)
= 9/24 - (56/24 - 18/24)
= 9/24 - 38/24
= - 29/24
b. 1/2 - (- 8/15 + 6/5)
= 1 x 15 / 2 x 15 - (- 8 x 2 / 15 x 2 + 6 x 6 / 5 x 6)
= 15/30 - (- 16/30 + 36/30)
= 15/30 - (20/30)
= - 5/30
= 5 x - 1 / 5 x 6
= - 1/6
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Verified answer
Bonjour,a. 3/8 - (7/3 - 3/4)
= 3 x 3 / 8 x 3 - (7 x 8 / 3 x 8 - 3 x 6 / 4 x 6)
= 9/24 - (56/24 - 18/24)
= 9/24 - 38/24
= - 29/24
b. 1/2 - (- 8/15 + 6/5)
= 1 x 15 / 2 x 15 - (- 8 x 2 / 15 x 2 + 6 x 6 / 5 x 6)
= 15/30 - (- 16/30 + 36/30)
= 15/30 - (20/30)
= - 5/30
= 5 x - 1 / 5 x 6
= - 1/6