1-5／6+7／12-9/20+11/30-13/42+15/56-17/72+19/90要简便.
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1-5／6+7／12-9/20+11/30-13/42+15/56-17/72+19/90
=1/6+7/12-9/20+11/30-13/42+15/56-17/72+19/90
=3/4-9/20+11/30-13/42+15/56-17/72+19/90
=6/20+11/30-13/42+15/56-17/72+19/90
=20/30-13/42+15/56-17/72+19/90
=15/42+15/56-17/72+19/90
=35/56-17/72+19/90
=28/72+19/90
=35/90+19/90
=54/90
=27/45
=3/5
=1/6+7/12-9/20+11/30-13/42+15/56-17/72+19/90
=3/4-9/20+11/30-13/42+15/56-17/72+19/90
=6/20+11/30-13/42+15/56-17/72+19/90
=20/30-13/42+15/56-17/72+19/90
=15/42+15/56-17/72+19/90
=35/56-17/72+19/90
=28/72+19/90
=35/90+19/90
=54/90
=27/45
=3/5
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