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Sagot :
Bonsoir,
Exercice 1 :
A = 2/7 - 3/7 x 14/9
A = 2/7 - 3/9 x 14/7
A = 2/7 - 1/3 x 2
A = 2/7 - 2/3
A = 6/21 - 14/21
A = -8/21
B = -7/8 x (2/3 - 1)
B = -7/8 x (2/3 - 3/3)
B = -7/8 x (-1/3)
B = 7/24
C = 4/5 x 1/4 + 2/5
C = 4/4 x 1/5 + 2/5
C = 1/5 + 2/5
C = 3/5
Exercice 2 :
A = (-2/5) / (3/15) + 2/15
A = (-2/5) x (15/3) + 2/15
A = (-2/3) x (15/5) + 2/15
A = (-2/3) x 3 + 2/15
A = -2 x 3/3 + 2/15
A = -2 + 2/15
A = -30/15 + 2/15
A = -28/15
B = 9/2 - (5/2) / (15/8)
B = 9/2 - 5/2 x 8/15
B = 9/2 - 8/2 x 5/15
B = 9/2 - 4 x 1/3
B = 9/2 - 4/3
B = 27/6 - 8/6
B = 19/6
Exercice 1 :
A = 2/7 - 3/7 x 14/9
A = 2/7 - 3/9 x 14/7
A = 2/7 - 1/3 x 2
A = 2/7 - 2/3
A = 6/21 - 14/21
A = -8/21
B = -7/8 x (2/3 - 1)
B = -7/8 x (2/3 - 3/3)
B = -7/8 x (-1/3)
B = 7/24
C = 4/5 x 1/4 + 2/5
C = 4/4 x 1/5 + 2/5
C = 1/5 + 2/5
C = 3/5
Exercice 2 :
A = (-2/5) / (3/15) + 2/15
A = (-2/5) x (15/3) + 2/15
A = (-2/3) x (15/5) + 2/15
A = (-2/3) x 3 + 2/15
A = -2 x 3/3 + 2/15
A = -2 + 2/15
A = -30/15 + 2/15
A = -28/15
B = 9/2 - (5/2) / (15/8)
B = 9/2 - 5/2 x 8/15
B = 9/2 - 8/2 x 5/15
B = 9/2 - 4 x 1/3
B = 9/2 - 4/3
B = 27/6 - 8/6
B = 19/6
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