0.589×(18.7×3.9+20)-53.722
    16.21*1.75*1/2*（1/3*1.75+7.58）+30.96*8.68+162.79*3.22-70.3*7.58*1/2*2/3*7.58
    16.21*1.75*1/2*（1/3*1.75+7.58）+30.96*8.68+162.79*3.22-70.3*7.58*1/2*2
    0.704×(18.7×3.9+20)-16.781
    2×35×√0.589
    0.589×(18.7×1.3+20)-53.722
    1+（-10）
    -3（-2）
    0.010101010101010*0.13-0.038500000000000-1
    1/(1/0.115-1)
    -4+5
    √((25.07/1.22)^2+〖59.9〗^2 )
    (121.6×1000)/(7×290)
    (73×1000)/(7×416)
    √((44.23/1.22)^2+〖89.21〗^2 )
    (181.1×1000)/(7×290)
    (128.8×1000)/(7×416)
    (181100-0.3×128800)/(0.9×0.598×300)
    121600/(0.8×0.76×300)
    73000/(0.9×0.598×300)+121600/(0.8×0.76×300)

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