1.5*(1+2.78*(221)/(1400+221)+0.15)
    14*1.6%+0.7%*150+0.35%*110-0.35%*150-40%*1%*150
    1.5*(1+2.78*(221+80)/(1400+221+80))
    14*1.6%
    272/34 865/45 286/22 348/46
    5300×0.006
    abs(-9)
    √(60^2+84^2)
    9减去5加上8乘以16=
    9减去5加上8
    9减去5
    19%8
    7%6
    -20/9
    12.333除3
    5/3*(-4/3)
    12.333乘3
    12.333乘以3
    5/3*(-1/3)-5/3
    (e^(14.09*0.09)-e^(-14.09*0.09))/((e^(14.09*0.09)+e^(-14.09*0.09))/2)

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