bonjour
A = 7/50 + 7 /50 * 10/3
= 7/50 + 70/150
= 21/150 + 70/150
= 91/150
B = 2/9 x ( 4/6 - 33/6 )
= 2 /9 x - 29/6
= - 58/54
= - 29/ 27
c = ( - 7/5 + 3) : ( ( 3 /10 + 7 )
= ( - 7/5 + 15/5) : ( 3 /10 + 70/10)
= 8 /5 : 73/10
= 8/5 * 10/73
= 80 / 365
= 16/ 73