-10*30*30+600*30-5000
    0.5(-1.73) ^2+7*-1.73+20 0.5(-2.53) ^2+7*-2.53+20 0.5(-3.1) ^2+7*-3.1+20 0.5(-8) ^2+7*-8+20 0.5(-12.89) ^2+7*-12.89+20
    63.8×0.65×0.6=
    63.8×0.63×0.6=
    63.8×0.64×0.6=
    37.8×0.64×0.6=
    25.8×0.64×0.6=
    16.5×0.6×0.6=
    37.8×0.64×0.6=
    37.6×0.64×0.6=
    37.5×0.64×0.6=
    arctan0.7291
    arctan0.6565
    arctan0.6565
    8∧-2/3
    tan(π/5)*tan(2π/5)+tan(2π/5)*tan(3π/5)+tan(3π/5)*tan(4π/5)
    tan(2π/5)
    tan(π/5)
    27.5×0.6×0.6=
    27.4×0.6×0.6=

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