一支笔和一道题
1至25 求周长 3.14 6.28 9.42 12.56 15.7 18.84 21.98 25.12 28.26 31.4 34.54 37.68 40.82 43.96 47.1 50.24 53.38 56.52 59.66 62.8 65.94 69.08 72.22 75.36 78.5
26至50求周长81.64 84.78 87.92 91.06 94.2 97.34 100.5 103.62 106.76 109.9 113.04 116.18 119.32 122.46 125.6 128.74 131.88 135.02 138.16 141.3 144.44 147.58 150.72 153.86 157
51至75求周长160.14 163.28 166.42 169.56 172.7 175.84 178.98 182.12 185.26 188.4 191.54 194.68 197.82 200.96 204.1 207.24 210.38 213.52 216.66 219.8 222.94 226.08 229.22 232.36 235.5
76至100求周长238.64 241.78 244.92 248.06 251.2 254.34 257.48 260.62 263.76 266.9 270.04 273.18 276.32 279.46 282.6 285.74 288.88 292.02 295.16 298.3 301.44 304.58 307.72 310.86 314
3.14X 1的2次方=3.143.14X 2的2次方=12.563.14X 3的2次方=28.263.14X 4的2次方=50.243.14X 5的2次方=78.53.14X 6的2次方=113.043.14X 7的2次方=153.863.14X 8的2次方=200.963.14X 9的2次方=254.343.14X 10的2次方=314
算题时只需将本经验代入题目即可。例如求半径为6的圆的面积 3.14X 6的2次方=113.04