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①=6/14+3/14+4/21
=9/14+4/21
=27/42+8/42
=35/42
=5/6
②=5/6-1/5-1/6
=5/6-1/6-1/5
=4/6-1/5
=10/15-3/15
=7/15
=9/14+4/21
=27/42+8/42
=35/42
=5/6
②=5/6-1/5-1/6
=5/6-1/6-1/5
=4/6-1/5
=10/15-3/15
=7/15
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