(145.38×4.865+16.3×12.486)/274.46
    (13.9×10^3-0.3×500.7×10^3)/(0.9×0.437×300)
    0.4×500.7×0.476
    (669.4×10^3)/(0.981×7917×215)
    (72.6×10^3)/(0.608×574)+(0.092×10^6)/7784
    (155.3×10^3)/(0.754×912×305)
    (155.3×10^3)/(0.973×912×305)
    3.063-(0.474+0.848)/2
    4.409-(4.068+4.151)/2
    ［1748×（1+0.054）×1.1216×1+0］×0.9898
    ［1-1/（1+8.0%）^54.81］/［1-1/（1+8.0%）^70］
    4e^(√3-1)-4-2√3
    (0.2×〖17.2〗^2-17.2+16.3)/10
    (0.2×〖17.2〗^2-17.2+16.3)/10
    (0.2×〖11.2〗^2-11.2+13.8)/10
    (0.2×〖15.5〗^2-15.5+24.4)/10
    (0.2×10^2-10+10)/10
    (784.00×6.43+330.82×9.67)/(54.54×0.47+40.49×1.66+682.8×6.03+267.86×9.67)
    (145.38-8.01×10)×1.78+2×16.3×√1.78+8.01×10
    (117.18-6.51×10)×1.78+2×16.3×√1.78+6.51×10

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