填空:1∏= 2∏= 3∏= 4∏= 5∏= 6∏= 7∏= 8∏= 9∏= 15∏= 25∏= 36∏= 49∏= 64∏= 81∏=

问题描述:

填空:1∏= 2∏= 3∏= 4∏= 5∏= 6∏= 7∏= 8∏= 9∏= 15∏= 25∏= 36∏= 49∏= 64∏= 81∏=


1∏=3.14
2∏=6.28
3∏= 9.42
4∏= 12.56
5∏=15.7
6∏= 18.84
7∏=21.98
8∏=25.12
9∏=28.26
15∏=47.1
16∏=50.24
25∏=78.5
36∏=103.14
49∏=153.86
64∏= 200.96
81∏=254.34