Réponse :
A) 9/7 +8/7=17/7
B)14/15+3/5= 23/15
C) 3/4+5/24= 23/24
D) 9/7-8/7= 1/7
E)5/8-11/20=3/40
F)14/4-5/2=1
Explications étape par étape
Réponse :
Explications étape par étape
Bonjour,
Recopie et complète
A) 9/7 +........./..........=17/7
.../... = 17/7 - 9/7
.../... = 8/7
9/7 + 8/7 = 17/7
B)......../.......+3/5= 23/15
.../... = 23/15 - 3/5
.../... = 23/15 - (3 x 3)/(3 x 5)
.../... = 23/15 - 9/15
.../... = 14/15
14/15 + 3/5 = 23/15
C) 3/4+...../.........= 23/24
.../... = 23/24 - 3/4
.../... = 23/24 - (3 x 6)/(4 x 6)
.../... = 23/24 - 18/24
.../... = 5/24
3/4 + 5/24 = 23/24
D) 9/7-..../.......= 1/7
.../... = 9/7 - 1/7
.../... = 8/7
9/7 - 8/7 = 1/7
E)5/8-..../......=3/40
.../... = 5/8 - 3/40
.../... = (5 x 5)/(8 x 5) - 3/40
.../... = 25/40 - 3/40
.../... = 22/40
.../... = (2 x 11)/(2 x 20)
.../... = 11/20
5/8 - 11/20 = 3/40
F)14/4.........5/2=1
(2 x 7)/(2 x 2) ... 5/2 = 2/2
7/2 ... 5/2 = 2/2
7/2 - 5/2 = 2/2
14/4 - 5/2 = 1