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:π是圆周率,等于3.14,r是圆的半径应用实例:圆的半径r是3米,面积S=π×r^2=3.14x3^2=28.26平方米
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wj?fr? de=1.732/3.14l=0.55159l=0.743l
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(2018-05-12 21:26)
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