Bonjour
A = 2/3 + 4/3 : 5/9
A = 2/3 + 4/3 x 9/5
A = 2/3 + 36/15
A = 10/15 + 36/15
A = 46/15
B = ( 2/3 + 4/7 ) : ( 5/9 - 1/3 )
B = ( 14/21 + 12/21 ) : ( 5/9 - 3/9)
B = 26/21 : 2/9
B = 26/21 * 9/2
B = 234/42 = 39/7
