（13.3792+1.5*10.316）*234.87+6.127704*234.87
    4÷4/7
    s^2=-10
    s^2=10
    (3.14-0.319)/3.14
    4.5/(0.33*3.32)
    3.5/(0.33*3.32)
    (3.14-0.32)/3.14
    3.14-0.36/3.14=
    5x+2x^2=84
    arctan0.215
    tanx=0.215
    atan2.575+atan(2.575/5)
    atan2.57+atan(2.57/5)
    arctan2.57+acrtan(2.57/5)
    arctan(2499/w)-arctan(34/w)＝1.3974
    atan(300/w)-atan(40/w)＝-9.874
    2.912+(0.1/24)*(-9*0.7384928-19*0.5736+5*0.392-0.199)
    x=15.3（1+6%）^x-1
    2.912+(0.1/24)*(-55*0.5736+59*0.392-37*0.199)

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