(4 2/5 + 3 1/3 ) : 17 1/3=
= ( 4 6/15 + 3 5/15) : 17 1/3=
=7 11/15 : 17 1/3=
= 116/15 : 52/3 =
= 116/15 * 3/52 =
= (29*1) / (3*13) = 29/39
( 11 3/10 - 8 7/9) : 7 17/30=
= (11 27/90 - 8 70/90 ) : 7 17/30=
= 2 47/90 : 7 17/30=
= 227/90 * 30/227 =
= (1 *1)/ (3*1)=
=1/3