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= 3 + 80/9 =
=3+ 8 8/9=
= 11 8/9
2)...= 3 1/2 : (2 3/8 - 1 6/8)=
= 7/2 : (1 11/8 - 1 6/8)=
= 7/2 : 5/8=
=7/2 *8/5=
=28/5=
=5 3/5