Sagot :
Bonsoir,
Tu mets au même dénominateur
2/7 + 9/7 = 11/7
5/16 + 9/4 = 5/16 + 9/4 * 4/4= 5/16 +36/16 = 41/16
Je te laisse détailler les autres
12/5 +11/20 = 48/20 + 11/20 = 59/20
17/36+ 20/36 = 37/36
Je te laisse calculer les autres:
2/9 + 8/9 = ?
7/32+ 20/32 = ?
13/64 + 24/64 = ?
9/40 + 16/40 = ?
Bonsoir,
Calculer en détaillant:
- 2/7 + 9/7 = 11/7
- 5/16 + 9/4 = 5/16 + (9*4)/(4*4)
= 5/16 + 36/16
= 41/16
- 12/5 + 11/20 = (12*4)/(5*4) + 11/20
= 48/20 + 11/20
= 59/20 = 2,95
- 17/36 + 5/9 = 17/36 + (5*4)/(9*4)
= 17/36 + 20/36
= 37/36
- 2/9 + 8/9 = 10/9
- 7/32 + 5/8 = 7/32 + (5*4)/(8*4)
= 7/32 + 20/32
= 27/32
- 13/64 + 3/8 = 13/64 + (3*8)/(8*8)
= 13/64 + 24/64
= 37/64
- 9/40 + 2/5 = 9/40 + (2*8)/(5*8)
= 9/40 + 16/40
= 25/40 = 5/8 = 0,625
* = multiplication
/ = division
Bonne soirée.