P76 p52 p77 p83

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P76 p52 p77 p83

P76 p52 p77 p83
P76 p52 p77 p83

P76 p52 p77 p83
P77
1.剩下的路程=1/3*1/2=1/6
全程=20除以1/6=120KM
2.110%-(3/8+2/5)=13/40
3.3.42÷3.8 =0.9=90%
100%-90%=10%