1/3【（15%-25%）+（15%-15%）+（15%-5%）】
    1/3【（16.67%-40%）+（16.67%-20%）+（16.67%+10%）】
    1+1/2+1/4+1/4
    -20lg0.050815
    1/(250×sqrt(0.25×84.22×84.22+1)/(84.22)/sqrt(0.0009×84.22×84.22+1)/sqrt(0.0047×0.0047×84.22×84.22+1)/sqrt(100×84.22×84.22+1))
    1/(250/(84.22)/sqrt(0.0009×84.22×84.22+1)/sqrt(0.0047×0.0047×84.22×84.22+1))
    1/3+1/4+3/4
    arctan(0.5×11.92)-90-arctan(10×11.92)-arctan(0.03×11.92)-arctan(0.0047×11.92)+180
    （20-4）^2
    （20-4）*2
    10^－4.75
    31350*0.3
    95*0.033
    95*0.035
    2500/9-36
    e0.15964416080443016642792555893252
    1÷90+1÷60
    2.5e^(-0.1182*2/12)+2.5e^(-0.1182*5/12)+2.5e^(-0.1182*8/12)+2.5e^(-0.1182*11/12)+102.5e^(-0.1182*14/12)=
    2.125e^(-0.1182*2/12)+2.125e^(-0.1182*5/12)+2.125e^(-0.1182*8/12)+2.125e^(-0.1182*11/12)+102.125e^(-0.1182*14/12)=
    sqrt（6.4*10^-5）

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