7/31/2019 Exercices Sur La Soustraction de Fractions - 2

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Exercices sur la soustraction de fractions - 2

Noublie pas de simplifier si besoin

1) 3/2 - 7/10 =

2) 5/3 - 1/2 - 3/7 =

3) 7/10 - 29/60 =

4) 4/9 - 13/54 =

5) 15/16 - 1/6 - 3/4 =

6) 7/9 - 17/63 =

7) 11/18 - 17/36 =

8) 5/9 - 10/21 =

9) 7/10 - 17/50 =

10) 17/36 - 1/6 =

7/31/2019 Exercices Sur La Soustraction de Fractions - 2

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Correction

1) 3/2 - 7/10 =

(3*5) / (2*5)7/10

15/10 - 7/10

8/10

(8/2) / (10/2)

4/5

2) 5/3 - 1/2 - 3/7 =

(5*2*7) / (3*2*7) - (1*3*7) / (2*3*7) - (3*3*2) / (7*3*2)

70/42 - 21/42 - 18/42

31/42

3) 7/10 - 29/60 =

(7*6) / (10*6)29/60

42/60 - 29/60

13/60

4) 4/9 - 13/54 =

(4*6) / (9*6)13/54

24/54 - 13/54

11/54

5) 15/16 - 1/6 - 3/4 =

(15*6) / (16*6) (1*16) / (6*16) - (3*24) / (4*24)

90/96 - 16/96 - 72/96

2/96

(2/2) / (96/2)

1/48

6) 7/9 - 17/63 =

(7*7) / (9*7) - 17/63

49/63 - 17/63

32/63

7/31/2019 Exercices Sur La Soustraction de Fractions - 2

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7) 11/18 - 17/36 =

(11*2) / (18*2) - 17/36

22/36 - 17/36

5/36

8) 5/9 - 10/21 =

(5*21) / (9*21) - (10*9) / (21*9)

105/189 - 90/189

15/189

(15/3) / (189/3)

5/63

9) 7/10 - 17/50 =

(7*5) / (10*5)17/50

35/50 - 17/50

18/50

(18/2) / (50/2)

9/25

10) 17/36 - 1/6 =

17/36 - (1*6) / (6*6)

17/36 - 6/36

11/36