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
    ((0.87/174)+(0.316/158))/0.5
    106*8.4/168
    0.448*2.41
    e2+16e—32
    √(1/1500)/0.03
    e3+16e—32
    √4*4
    （1/1500）^0.5/0.03
    ((1/8000)/0.03)
    1-0.99^200

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