7.8×0.62×0.55+3=
    15.6×0.62×0.55+3=
    23.5×0.62×0.55+3=
    23.5×0.6×0.55+3=
    23.5×0.61×0.55+3=
    15.6×0.61×0.55+3=
    15.6×0.6×0.55+3=
    7.8×0.6×0.55+3=
    16.8×0.68×0.5=
    5-7
    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]

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