sqrt(333^2+667)
    -2*sin1*sin1*sin1-sin2*cos1*cos1
    -2*sin1*sin1*sin1-sin2*cos1
    sqrt(1997*1998*1999*2000+1)
    3244000/(0.9×24818)
    (972+971+978+975)*25
    26.8×0.8×0.6=
    26.8×0.8×0.6=
    26.8×0.6×0.8=
    236.89/6.5% ×(1-[1/(1+6.5%)^5]
    255.63/(1+5%)×4%+255.63/(1+5%)×1.5%×(1+7%+3%+2%）
    23.21×1×1.5%
    23.21×(1-8.22%-0)×12
    (4×4900/3×1000)/(3×3.14×80×80)
    16.4×0.7=
    26.8×0.6×0.8=
    81×0.6×0.8=
    81×0.6×0.82=
    45.5×0.6×0.82=
    26.8×0.6×0.82=

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