20+17×2.1+18.5×3+18.6×2.5+19.1×6.2
    49.211×（9.5-2.1+0.84）+105.784×（9.5-2.1-3+1.22）+241.001×（9.5-2.74）-207.57×（9.5-2）-415.82×（9.5-9）
    49.211×（9-2.1+0.84）+105.784×（9-2.1-3+1.22）+241.001×（9-2.74）-207.57×7
    49.211×（9-2.1+0.84）+105.784×（9-2.1-3+1.22）+241.001×（9-2.74）-415.80×0.5
    49.211×（5.75-2.1+0.84）+105.784×（5.75-2.1-3+1.22）+52.94×0.32-207.57×（5.75-2）
    (5.75-5.1)/3×(2×76.1825+86.698)/(76.1825+86.698)
    [20+17×2.1+18.5×3+18.6×(5.75-5.1)]×0.8696-2×11×0.9325
    (76.1825+[20+17×2.1+18.5×3+18.6×(5.75-5.1)]×0.8696-2×11×0.9325)/2×(5.75-5.1)
    44√3÷3
    14974.5455 -(102666.6667-100000)
    200000*(1+0.08*(1/3))
    214974.5455 - 205333.3333 =
    ln1
    (19.30×8.5×9.60+12×19.32)/(18.78×(9.5+8.5)+20)
    (4.3×19.1+4.2×19.5)/8.5
    (2.1×17+3×18.5+2.5×18.6+6.2×19.1+4.2×19.5)/18
    (131.57*15.2+316.99*10.5+481.4553*5.39+1184.93*1.69)/(49.21*16.24+105.77*13.62+241*11.06+616.8048*6.34+431.2428*1.76)
    (207.57×16+415.80×9+498.423×5.93+1380.99×1.89)/(49.211×16.741+105.784×14.123+241.001×11.563+636.830×6.940+496.13×2)
    (217.59×15.7+403.86×9+498.423×5.93+1380.99×1.89)/(49.211×16.741+105.784×14.123+241.001×11.563+636.830×6.940+496.13×2)
    (217.59×15.7+225.95×11+498.423×5.93+1380.99×1.89)/(49.211×16.741+105.784×14.123+241.001×11.563+636.830×6.940+496.13×2)

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