

22/7=3.14
=+
2
2
3.14
2
=+
3.14810
3.14×8×10
31.4×8
=251.22
2
3.14×82
=3.14×64
=200.962
=+
251.2+200.96
=452.162
10201015
3.141020
3.14×10×20
=3.14×200
=6282
2
3.1410
3.14×102
=3.14×100
=3142
=628+314=9422
2
3.141015
2×3.14×10×15
=9422
3.14(
2
3.1462




=
