12/7-ï¼1/3÷7/15+4/13ï¼
=12/7-ï¼5/7+4/13ï¼
=12/7-5/7-4/13
=1-4/13
=9/13
25/17-1/3*9/8-5/8
=25/17-3/8-5/8
=25/17-ï¼3/8+5/8ï¼
=25/17-1
=8/17
1-5/8÷25/28-9/10
=1-7/10-9/10
=1-ï¼7/10+9/10ï¼
=1-1.6
=-0.6
追é®æ±ææ¼äºä¸é¢ï¼7/3*7/3+4/5+4/9
追ç7/3*7/3+4/5+4/9
=49/9+4/9+4/5
=53/9+4/5
=6å31/45