128/(65+128)
    1000/（1+15%）^0+2000/(1+15%)^1
    2000/(1+15%)^5+4000/(1+15%)^6
    1000+2000/(1+12%)^1
    2000/(1+12%)^5+4000/(1+12%)^6
    2arctan(√3/3(sin(arctan(√3/2))))
    π/2-arcsin0.75
    2arctan(√3×0.7137/3)
    arctan(√3×0.7137/3)
    √3×0.7137/3
    arctan(√3/2)
    π/2-arcsin0.75
    π/2-arcsin3/4
    2arctan(1/√3sin(arctan√3/2))
    2arctan(√3/3sin(arctan√3/2))
    π/2-arcsin0.75
    2arctan√6/6
    arctan√6/6
    √101÷1.97
    ［1-1/（1+8.0%）^35.1］/［1-1/（1+8.0%）^50］

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