49) 1 - (2/3 + 1/5) = 1 x 15 / 1 x 15 - (2 x 5 / 3 x 5 + 1 x 3 / 5 x 3) = 15/15 - (10/15 + 3/15) = 15/15 - 13/15 = 2/15 Oui il en reste 2/15 pour leur frère Tom.
51) A = 2 - 25/9 A = 2 x 9 / 1 x 9 - 25/9 A = 18/9 - 25/9 A = - 7/9
B = 2/7 - 7 B = 2/7 - 7 x 7 / 1 x 7 B = 2/7 - 49/7 B = - 47/7
C = - 5/3 - 10 C = - 5/3 - 10 x 3 / 1 x 3 C = - 5/3 - 30/3 C = - 35/3
D = 11/9 - 5/4 + 5 D = 11 x 4 / 9 x 4 - 5 x 9 / 4 x 9 + 5 x 36 / 1 x 36 D = 44/36 - 45/36 + 180/36 D = 179/36
E = - 5/3 - 5/6 + 8/9 E = - 5 x 12 / 3 x 12 - 5 x 6 / 6 x 6 + 8 x 4 / 9 x 4 E = - 60/36 - 30/36 + 32/36 E = - 58/36 E = 2 x - 29 / 2 x 18 E = - 29/18
Lista de comentários
Verified answer
Bonjour,49)
1 - (2/3 + 1/5)
= 1 x 15 / 1 x 15 - (2 x 5 / 3 x 5 + 1 x 3 / 5 x 3)
= 15/15 - (10/15 + 3/15)
= 15/15 - 13/15
= 2/15
Oui il en reste 2/15 pour leur frère Tom.
51)
A = 2 - 25/9
A = 2 x 9 / 1 x 9 - 25/9
A = 18/9 - 25/9
A = - 7/9
B = 2/7 - 7
B = 2/7 - 7 x 7 / 1 x 7
B = 2/7 - 49/7
B = - 47/7
C = - 5/3 - 10
C = - 5/3 - 10 x 3 / 1 x 3
C = - 5/3 - 30/3
C = - 35/3
D = 11/9 - 5/4 + 5
D = 11 x 4 / 9 x 4 - 5 x 9 / 4 x 9 + 5 x 36 / 1 x 36
D = 44/36 - 45/36 + 180/36
D = 179/36
E = - 5/3 - 5/6 + 8/9
E = - 5 x 12 / 3 x 12 - 5 x 6 / 6 x 6 + 8 x 4 / 9 x 4
E = - 60/36 - 30/36 + 32/36
E = - 58/36
E = 2 x - 29 / 2 x 18
E = - 29/18