4/5ä¸3/10å2/3
=ï¼24-9+20ï¼/30
=7/6
1ä¸ï¼3/4ä¸3/8ï¼
=1/4+3/8
=5/8
1/2å1/4ä¸1/6
=ï¼6+3-2ï¼/12
=7/12
5/6ä¸ï¼1/2ä¸1/3ï¼
=5/6-1/6
=2/3
7/8ä¸5/12å1/6
=ï¼21-10+4ï¼/24
=15/24
=5/8
2/3åï¼1/2ä¸1/6ï¼
=2/3+1/3
=1
3/4ä¸5/8å5/6
=ï¼18-15+20ï¼/24
=23/24
5/9å2/3ä¸2/5
=11/9-2/5
=ï¼55-18ï¼/45
=37/45
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