bonjour
a. ( 3 - 2/3 ) : ( 4/3 x 7 )
= ( 9/3 - 2 /3) : 28/3
= 7/3 x 3/28
= 21/ 84 = 1/4
b. ( 2/3 : 5/6 ) - 2/5
= ( 2/3 x 6/5) - 2/5
= 12 /15 - 6/15
= 6/15 = 2/5
c. ( - 3/4 + 1/2) : ( 2/5 - 5/2 )
= ( - 3/4 + 2/4 ) : ( 4/10 - 25/10 )
= - 1 /4 : - 21 /10
= - 1/4 x - 10/21
= 10/ 48 = 5/ 24
