(1/4 - 1/5) x (1 - 7/15) = (1 x 5 / 4 x 5 - 1 x 4 / 5 x 4) x (1 x 15 / 1 x 15 - 7/15) = (5/20 - 4/20) x (15/15 - 7/15) = 1/20 x 8/15 = 8/300 = 4 x 2 / 4 x 75 = 2/75
- 1/3 + 2/7 1/2 - 7/8 = 1 x 7 / 3 x 7 + 2 x 3 / 7 x 3 1 x 4 / 2 x 4 - 7/8 = 7/21 + 6/21 4/8 - 7/8 = 13/21 : - 3/8 = 13/21 x - 8/3 = - 104/63
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laura13062002
Bonjour ,voilà le 1 er!!!! Je cherche le 2 eme et je l envoie
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laura13062002
Dsl j'ai essayé mais l'autre je n arrive pas
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Bonjour,(1/4 - 1/5) x (1 - 7/15)
= (1 x 5 / 4 x 5 - 1 x 4 / 5 x 4) x (1 x 15 / 1 x 15 - 7/15)
= (5/20 - 4/20) x (15/15 - 7/15)
= 1/20 x 8/15
= 8/300
= 4 x 2 / 4 x 75
= 2/75
- 1/3 + 2/7
1/2 - 7/8
= 1 x 7 / 3 x 7 + 2 x 3 / 7 x 3
1 x 4 / 2 x 4 - 7/8
= 7/21 + 6/21
4/8 - 7/8
= 13/21 : - 3/8
= 13/21 x - 8/3
= - 104/63