(20+19.4×1.7+19.2×3.1+19.8×3)×0.52-2×54×0.72
    (20+19.4×1.7+19.2×3.1+19.8×3+20×2.5)×0.52-2×54×0.72
    (20+19.4×1.7+19.2×3.10)×0.61-2×31.0×0.78
    (20+19.4×1.7+19.2×3.1+19.8×3+20×2.5+22×1.8)×0.33-2×20×0.58
    (20+19.4×1.7+19.2×3.10+19.8×3)×0.61-2×31×0.87
    (20+19.4×1.7+19.2×3.10+19.8×3)×0.61-2×54×0.87
    10-(11/3)
    arccos0.99
    (-5249.740021+5219.425260)/5249.7400211.3235/(3.25×10^7)×(-1587341)
    tan(20/5)
    tan(20/2.5)
     tan(20/1)=
    tan(20/1)
    tan20/1
    （5）
    1.895494/(0.004167*550*0.000000001*3.1415926)
    -10-50
    arccos0.4333
    (-5249.740021+4517.622343)/5249.740021
    arccos0.901

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