5/6-5/7+3/24脱式计算
=140/168-120/168+21/168
=20/168+21/168
=41/168
red
5/6-5/7+3/24
=5/6+3/24-5/7
=20/24+3/24-5/7
=23/24-5/7
=161/168-120/168
=41/168
5/6-5/7+3/24
=35/42-30/42+1/8
=5/42+1/8
=20/168+21/168
=41/168
5/6-5/7+3/24
=20/24+3/24-5/7
=23/24-5/7
=（161-120）/168
=41/168
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