Bonjour
recopier et compléter par le sign + ou - :
4/5 … 3/20 = 19/20
(4 x 4)/(5 x 4) = 16/20
Donc :
4/5 + 3/20 = 19/20
8/9 … -2/3 = 2/9
(-2 x 3)/(3 x 3) = -6/9
Donc :
8/9 + (-2/3) = 2/9
7/6 … 5/9 = 11/18
(7 x 3)/(6 x 3) = 21/18
(5 x 2)/(9 x 2) = 10/18
Donc :
7/6 - 5/9 = 11/18
-3/4 … 1/6 = -7/12
(-3 x 3)/(4 x 3) = -9/12
(1 x 2)/(6 x 2) = 2/12
donc :
-3/4 + 1/6 = -7/12
