Bonsoir,
opposé de 6/7 =>-6/7
l'inverse de 18/14 = 14/18
-6/7 * 14/18 = -84/126 = - 42/63 = -14/21
L'inverse de 6/7 = >7/6
7/6 + 14/21 =
98/84 + 56/84 = 154/84 = 77/42 = 11/ 6
