180-90-arctan0.4-arctan0.2
    90-arctan2.71-arctan2.71/2
    120*91*（9+20/30）
    19600-20000
    2*0.062*1500
    140*140
    2*0.027*1500
    1500*2*0.016
    0.05*(2.03^2-1.7^2)
    0.05*(1.46^2-1.26^2)
    0.05*(1.17^2-1.02^2)
    120*91*(10+15/30)*1
    (31.89+31.89+9*3.81)*3.81/2
    (31.89+31.89+9*2.22)*2.22/2
    (31.89+31.89+9*1.52)*1.52/2
    4*(5/12)^3-5*(5/12)^2+4
    （32.236+34.148+36.121+31.689+33.608+33.864+31.959+35.622+33.729+33.81+34.419+35.41+34.01+28.82+34.42+33.90+32.66+33.90+33.45+33.34)/20=
    -1/8-1/2
    112/22.4/10^3
    ((2*0.87/174)+(0.316/158))/0.5

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