18×4.5+20
    （274.48+0+8.23+9.61）×8%
    274.48×[（1+0.0345）-1]+（0+8.23）×[（1+0.0345）^0.5-1]
    1加1
    20242025×20252024-20242024×20252025
    3^3^3^3
    arctan0.1
    (11.6×10^3-0.3×207.6×10^3)/(0.9×0.437×300)
    0.4×207.6×0.476
    0.4×207.6×0.476
    (277.3×10^3)/(0.950×7917×215)
    (48.9×10^3)/(0.608×574)+(0.094×10^6)/7784
    (15.2×10^6)/(0.76×237000×215)
    1.07-0.282/0.92
    0.95×4320/〖187.56〗^2 ×(3555×200)/237000×[√(1+((187.56×11.4)/(4.4×200))^2 )+0] √(235/235)
    (3976×11.4)/(100×200)
    3976/21.2
    4.108-(0.486+0.484)/2
    4.963-(3.576+3.524)/2
    5.018-4.378

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