1815两位数除以一位数笔算1978怎么笔算

圆周率用笔算怎么算_百度知道
圆周率用笔算怎么算
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里斯:π 2*2*4*4*6*6*8*8--=--------------------2 1*3*3*5*5*7*7*9欧拉;3 = 1 + 1/7 + 1/72 + ……莱布尼兹和格里高利;9 - ……这些公式看着简单;3 + 1&#47:π/32 + 1/5 - 1/52 + 1/4 = 1 - 1&#47,但实际上收敛极为缓慢:π&#47
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方法二,后相除。注方法一。连任一点作半径,于圆周作商:正n边形边越多结果越准确:用一个已知长的绳子作一圆周,量其半径:作一正n边形(很多很多边)任取两对点两两连线交于一点以此点作圆心
楼上的回答无解。在这方面,古人祖冲之已经解决了用笔算的方法:1、约率:22/7---准确率在3位2、密率:355/113---准确率在7位这个成果得到了国际的认可,是笔算圆周率的有效数字。
22/7355/113
圆的周长除以直径
这个应该收敛得快一点,不过要先算根号3:2*3^0.5*(1-1/(3*3)+1/(9*5)-1/(27*7)+1/(81*9)-...)
3.141 93 83 97 05 92 86 34 67 13 93 82 08 50 38 44 30 10 46 33 71 48 48 48 60 24 15 20 54 67 11 20 46 09 65 92 32 18 79 51 91 11 73 43 ...
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