（tan(45+12/2)）^2
    （tan(45-12/2)）^2
    （tan(45-12/2)）^2
    （tan(45-12/2)）^2
    （2.99-2.99/1.13*0.13+0.08）/7.24
    0.05除0.02
    (7.5×10^3)/(0.867×453×215)+(0.6×0.6×10^6)/(1.15×4797×(1-(0.8×7.5)/212.78)×215)
    (π^2×2.06×10^5×453)/(1.1×〖62.73〗^2 )
    1003/15.99
    √(115857/453)
    2^31 - 1=
    0.677×(8.55×1200^4)/(100×9350×8333330)
    (8.10×10^3×125000)/(8333330×100)
    0.6×10.38×1.2+0.617×0.85×1.2
    (1.71×10^6)/166667
    (1.71×10^6)/166667
    0.1×10.38×〖1.2〗^2+0.177×0.85×〖1.2〗^2
    1.1×[1.0×(0.103+0.75+0.75+46.8)+1.0×(2.5+0.936)]×0.15
    1.1×[1.0×(0.103+0.75+0.75+46.8)+1.0×(2.5+0.936)]
    1.1×1.5×(2.5+0.936)×0.15

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