bonsoir
Calculer :
2/3 + 5/3 = (2 + 5)/3 = 7/3
17/9 - 4/9 = (17 - 4)/9 = 13/9
3/11 + 4/11 = (3 + 4)/11 = 7/11
-15/17 + 7/17 = (-15 + 7)/17 = -8/17
Calculer sous forme fractionnaire puis simplifier :
-9/5 + 6/5 = (-9 + 6)/5 = -3/5
11/9 - 5/9 = (11 - 5)/9 = 6/9 = (2 x 3)/(3 x 3) = 2/3
-7/8 + 5/8 = (-7 + 5)/8 = -2/8
19/20 - 7/20 - (-3/20) = (19 - 7 + 3)/20 = 15/20 = (3 x 5)/(4 x 5) = 3/4
Compléter par le nombre qui convient :
5/9 + .../9 = 7/9
.../9 = 7/9 - 5/9
.../9 = (7 - 5)/9
.../9 = 2/9
5/9 + 2/9 = 7/9
13/11 - .../11 = 9/11
13/11 - 9/11 = .../11
(13 - 9)/11 = .../11
4/11 = .../11
13/11 - 4/11 = 9/11
9/7 - .../7 = -13/7
9/7 + 13/7 = .../7
(9 + 13)/7 = .../7
22/7 = .../7
9/7 - 22/7 = -13/7
-7/5 - .../5 = -13/5
-7/5 + 13/5 = .../5
(-7 + 13)/5 = .../5
6/5 = .../5
-7/5 - 6/5 = -13/5
2/3 - .../3 = -5/3
2/3 + 5/3 = .../3
(2 + 5)/3 = .../3
7/3 = .../3
2/3 - 7/3 = -5/3
.../13 - 5/13 = -2/13
.../13 = 5/13 - 2/13
.../13 = (5 - 2)/13
.../13 = 3/13
3/13 - 5/13 = -2/13
