arccos（0.43：0.82）
    arccos（0.52439）
    360.83/6.5%×(1-[1/(1+6.5%)^5]
    360.83/6.5%×(1-[1/(1+6.5%)^5]
    7678*1.74+1789+3729
    440.54+0.6+0-80.31
    4.41+1.14+0.91+73.85
    440.54/(1+5%)×12%+440.54/(1+5%)×5%×(1+7%+3%+2%）
    441.14/(1+5%)×12%+441.14/(1+5%)×5%×(1+7%+3%+2%）
    1140×0.08%
    543*1.5/(543*1.5+700)
    440.54×1%
    40×1×1.5%
    40×(1-8.22%-0)×12
    543*1.3/(543*1.3+700)
    543/(543+700)
    e3
    -20lg0.2
    (ln((0.9125*0.7371)/(0.9636*0.8608)))/(1-0.9636)^2
    ln((0.1*0.5035)/(0.1156*0.8608))/(1-0.1156)^2

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