6: 3.14X2X2=12.56厘米
15.7÷3.14÷2=2.5厘米
7: 3.14X12=37.68分米
8: 3.14X5x2x2=62.8厘米
9: (10-0.58)÷3=3.14(米)
3.14÷3.14=1(米)
10: 3.14x3x2-3.14x2x2
=3.14x2x1
=6.28厘米
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