212
2015 3 17 42 2015 5 1
2015 3 27
3
10 20
1
2 5
2015 5 1 2013 2 22 2015 23
400000 m2
= [ 100000 m2 15 / m2 + 400000 m2 -100000 m2 10 / m2 ] =450000
=450000