（4+1.1×2+11+10+1.8+10+2.2×2+1.8+1.5+10+3.7+22+2.2+65+15+7.5+36+7.5+15+22）×20
    (4.5×10^3-0.3×1419.5×10^3)/(0.9×0.44×300)
    (4.0-0.08×25) √(14.3/300)
    (4.0-0.08×25) √(14.3/300)
    0.4×1419.5×0.883
    0.5×114.3×1742400
    (1.1×24.59×10^6)/266666.67
    (245.9×0.4)/4
    983.6/4
    √(((8.48+45.75)/1.22)^2+〖38.93〗^2 )
    (59.0×10^6)/1515609.26
    (59.0×10^6)/1289631.53
    (112.5×10^3)/5560.8
    (95.3×10^3)/(710×8.4+754.4×7)
    2×(397.2-2×10)
    2×(150-2×12)+4×(150-11.5-2×12)
    (3.01×10^8)/(233.4-34.8)
    2×8.4+18
    (3.01×10^8)/233.4
    2×((150×〖8.4〗^3)/12+150×8.4×〖229.2〗^2 )+2×(((150-11.5)×〖8.4〗^3)/12+(150-11.5)×8.4×〖202.8〗^2 )+(2×(7×〖397.2〗^3)/12)

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