18×3.2×0.22
    18×38.1×0.22
    18×20.65×（1-20.65×0.22×1/14.85）
    18×20.65×（1-20.65×0.22×tan45/14.85）
    2.5*14.292
     257.256/18
    257.256*0.5
    0.45 × 2^(5-1) × 18 ×1.985
    0.7*189.26/1.318
    0.7*233.95/1.318
    13.8*1620*87.5*(1204-87.5/2)
    11.2092×0.008^(5)-33.4747×0.008^(4)+37.8756×0.008^(3)-20.2753×0.008^(2)+5.6509×0.008+0.0207
    -21.988×0.008^(6)+76.672×0.008^(5)-106.23×0.008^(4)+74.872×0.008^(3)-28.672×0.008^(2)+6.3366×0.008+0.01
    -21.988×0.134^(6)+76.672×0.134^(5)-106.23×0.134^(4)+74.872×0.134^(3)-28.672×0.134^(2)+6.3366×0.134+0.01
    11.2092×0.006^(5)-33.4747×0.006^(4)+37.8756×0.006^(3)-20.2753×0.006^(2)+5.6509×0.006+0.0207
    -21.988×0.0387^(6)+76.672×0.0387^(5)-106.23×0.0387^(4)+74.872×0.0387^(3)-28.672×0.0387^(2)+6.3366×0.0387+0.01
    -21.988×0.006^(6)+76.672×0.006^(5)-106.23×0.006^(4)+74.872×0.006^(3)-28.672×0.006^(2)+6.3366×0.006+0.01
    69/(200000*0.44)
    69/(200000*0.44)
    1000000/5548525.92

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