Sagot :
a) A = 8/3 - 5/3 : 20/21
= 8/3 - 5/3 x 21/20
= 8/3 - 105/60
= 11/12
b) B = ( 2 + 2/3 ) : ( 4/5 - 2/3 )
= 8/3 : 2/15
= 8/3 x 15/2
= 20
= 8/3 - 5/3 x 21/20
= 8/3 - 105/60
= 11/12
b) B = ( 2 + 2/3 ) : ( 4/5 - 2/3 )
= 8/3 : 2/15
= 8/3 x 15/2
= 20
a = 160/60 - 105/60
= 11/12
b = (6/3+2/3) : (12/15 - 10/15)
= 8/3 : 2/15
= 8/3 x 15/2
= 120/6
= 20
= 11/12
b = (6/3+2/3) : (12/15 - 10/15)
= 8/3 : 2/15
= 8/3 x 15/2
= 120/6
= 20