2×(40×4.3+40×4.2)+150×0.25
    2×(40×4.3+40×3.7)+150×0.25
    2×(40×4.3+40×3.2)+150×0.25
    2×(40×4.3+40×2.2)+150×0.25
    tan18.763
    tan14.789
    tan12.422
    tan9.286
    tan7.072
    tan24.844
    tan18.752
    tan14.144
    arctan0.768
    arctan0.568
    arc tan0.463
    arctan0.336
    arctan0.252
    （494.86/2.476）*1.8
    1/2×6.28×(60×3+180×28)+3.14×0.7×0.8×[800+5.0×20×(28-3)]
    7030.31+15.7×28

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