Bonsoir,
41/78- 1 = 41/78 - (1 x 78) / (1 x 78) = 41/78 - 78/78 = - 37/78
104/203 - 1 = 104/203 - (1 x 203) / (1 x 203) = 104/203 - 203/203 = - 99/203
1 - 21/22 = (1 x 22) / (1 x 22) - 21/22) = 22/22 - 21/22 = 1/22
1 - 98/98 = (1 x 98) / (1 x 98) - 98/98 = 98/98 - 98/98 = 0.
