5分之3-15分之7+10分之7= 18/30-14/30+21/30=25/30=5/6
107-(1/2-1/3)=107-1/6=106又6分之5
3/5-(2/3-7/12)=3/5-2/3+7/12=36/60-40/60-35/60=31/60
9/10-(1/5+3/10)=9/10-3/10-1/5=1/5-1/5=0
5-(2/5+3/10)==5-(4/10+3/10)=5-7/10=4又10分之3
4/5-(3/4-5/12)=4/5-3/4+5/12=48/60-45/60+25/60=7/15
5/18+(7/12-1/3)= =5/18+7/12-4/12=5/18+1/3=5/18+6/18=11/18
4-3/14-11/14= 4-1=3
从3里面减去8/7与5/6的和,差是多少?
3-(7/8+5/6)
=3-(21/24+20/24)
=3-41/24
=1又24分之7
打110吧