1.865020
3.a是9,b是8,8*9=72
4.97分,15岁,第2名
6.最大:(2001*1+2001*1+1*1)*2 最小:2001/3=667(cm)
=(2001+2001+1)*2 (667*3+667*1+1*3)*2
=(4002+1)*2 =(2001+667+3)*2
=4003*2 =(2668+3)*2
=8006(cm2) =2671*2
=5342(cm2)
7.20,91,33. 26,42,55 35,44,39
8.132+40+40 212/2=106(km)
=132+80
=212(km)