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/ 84
= 5/42
