7/31/2019 Exercices sur laddition de fractions - 1

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Exercices sur laddition de fractions - 1

Noublie pas de simplifier si besoin

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7/31/2019 Exercices sur laddition de fractions - 1

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7/31/2019 Exercices sur laddition de fractions - 1

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7/31/2019 Exercices sur laddition de fractions - 1

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Correction

1) (1*5)/(3*5) + (2*3)/(5*3) = 5/15 + 6/15 = (5+6)/15 = 11/15

2) (2*2)/(3*2) + 5/6 = 4/6 + 5/6 = (4+5)/6 = 9/6 = (9/3) / (6/3) = 3/2

3) (3*5)/(4*5) + (1*4)/(5*4) = 15/20 + 4/20 = (15+4)/20 = 19/20

4) (5*12)/(7*12) + (1*7)/(12*7) = 60/84 + 7/84 = (60+7)/84 = 67/84

5) (2*3)/(5*3) + 4/15 = 6/15 + 4/15 = (6+4)/15 = 10/15 = (10/5) / (15/5) = 2/3

6) (2*2)/(9*2) + (9*9)/(2*9) = 4/18 + 81/18 = (4+81)/18 = 85/18

7) (2*8)/(7*8) + (3*7)/(8*7) = 16/56 + 21/56 = 37/56

8) (1*9)/(11*9) + (2*11)/(9*11) = 9/99 + 22/99 = 31/99

9) 7/20 + (4*4)/(5*4) = 7/20 + 16/20 = (7+16)/20 = 23/20

10) (5+5)/6 = 10/6 = (10/2)/(6/2) = 5/3

Fait par Sandrine L. (Anna-Etincelle)

http://amourdenfantsetief.blogspot.fr

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