bonjour
B = 2/3 + ( 3 /4 x 7 ) : 5 + 16/7 : 10
= 2/3 + 21/4 x 1/5 + 16/7 x 1/10
= 2/3 + 21 /20 + 16/70
= 2/3 + 21/20 + 8/35
= 1 400 / 2 100 + 2 205 / 2 100 + 480 / 2 100
= 4 085 / 2 100
= 817 / 420
C = ( 36/35 x 21 ) / 12
= 756/35 : 12
= 108/ 5 x 1/12
= 108/60
= 9 /5
E = ( 4 - 1 /2 ) : 3
= ( 8/2 - 1 /2) x 1 /3
= 7/2 x 1/3
= 7 /6
