第1个回答 2011-08-21
1-3/10-2/5=1-3/10-4/10(通分)=3/10
5-3/7+4/7=5+1/7=5又1/7(带分数)=36/7(假分数)
23/24-1/6-3/8=23/24-4/24(通分)-9/24(通分)=12/24=1/2
4/9+1/10+5/9=(4/9+5/9)+1/10=1+1/10=11/10(假分数)
1/12+3/8+11/12+5/8=(1/12+11/12 )+(3/8+5/8)=1+1=2
1-(3/11-5/9)=1-(27/99-55/99)=99/99-27/99+55/99=127/99