第71页

信息发布者：
5
10
0.49
3.63
11.3
0.36
A
C
=2×1.8+4.8
=3.6+4.8
=8.4
=4.38÷(2.5×4)
=4.38÷10
=0.438
=6.3×(2.1+7.9)
=6.3×10
=63
=73.8-0.75-0.25
=73.8-(0.75+0.25)
=73.8-1
=72.8
=8.52-(3.45-2.55)
=8.52-0.9
=7.62
=28.6×(101-1)
=28.6×100
=2860
121-3.8×5= 102(千米)
102÷(3.8+4.7)=12(天)
答：还需要12天才能修完。
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