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1 2/7+2 5/6+3 5/7+1 1/6=
4/9+1 2/3+2 5/9+1/3=
2 1/5+3/8+1 4/5+5/8=
1 3/10+1/4+2 7/10+3/4=
1 2/7+2 5/6+3 5/7+1 1/6=
4/9+1 2/3+2 5/9+1/3=
2 1/5+3/8+1 4/5+5/8=
1 3/10+1/4+2 7/10+3/4=
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1)1 2/7+2 5/6+3 5/7+1 1/6=4 7/7+3 6/6=5+4=9; ///2)4/9+1 2/3+2 5/9+1/3=2 9/9+1 3/3=3+2=5; ///3)2 1/5+3/8+1 4/5+5/8=3 5/5+8/8=4+1=5; ///4)1 3/10+1/4+2 7/10+3/4;3 10/10+4/4=4+1=5;