Sagot :
Bonjour,
A= 6/12 + 4/12 -3/12= 7/12
B= 20/90 -6/90 = 14/90 = 7/45
C= -3/7 + 3= -9/21 + 63/21 = 54/21 = 18/7
D= - 200/20 = -10
Réponse :
A) 1/2 + 1/3 - 1/4
= 6/12 + 4/12 - 3/12 (Le plus petit commun multiple de 2, 3 et 4 est 12)
= 7/12
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B) 2/9 - 1/15
= 10/45 - 3/45 (Le plus petit commun multiple de 9 et 15 est 45)
= 7/45
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C) (3 X -1/7) + 3
= (-3/7) + 3/1
= -3/7 + 21/7
= 19/7
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D) -8/5 X 25/4
= (-8 X 25) / (5 X 4)
= -8/4 X 25/5
= -2 X 5
= -10