1-0.35×√(804.9/580205.41)+0.35×√(804.9/580205.41)×((-89.3)/(-120.2))
    (1527.2×10^3)/(0.995×31730.1×215)+(0.969×622.2×10^6)/(1.15×7934076.85×(1-(0.8×1527.2)/534579.00)×215)
    0.986×0.983
    1-0.35×√(1527.2/914281.29)+0.35×√(1527.2/914281.29)×(81.3/(-622.2))
    1-0.35×√(1527.2/914281.29)+0.35×√(1527.2/914281.29)×(0)
    (π^2×2.06×10^5×20407.8)/(1.1×〖8.4〗^2 )
    (π^2×2.06×10^5×31730.1)/〖8.4〗^2
    3000/357.106
    7.994-5.615
    7.326-5.499
    28000×4+4848.9×6+30440×0.7+1268×4+140.85×4+1745.1×0.64+5×1200+50×200=
    343.5+775+500=
    140.8+28.16
    1842.9/365
    (4+1.1+11+10+1.8+10+2.2+1.8+1.5+10+3.7+22+2.2+65+15+7.5+36+7.5+15+22)×7
    (4+1.1+11+10+1.8+10+2.2+1.8+1.5+10+3.7+22+2.2+65+15+7.5+36+7.5+15+22)×8
    4+1.1×2+11+10*4+1.8+10*4+2.2×2+1.8+1.5+10*4+3.7+22*18+2.2+65*20+15+7.5+36+7.5+15+22*18
    5052*300
    （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)

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