6÷2×（2+1）
    -2500-2000/(1+0.2)+1200×[(1+0.2)^9-1]÷0.2÷(1+0.2)^9÷(1+0.2)
    -2500-2000/(1+0.19)+1200×[(1+0.19)^9-1]÷0.19÷(1+0.19)^9÷(1+0.19)
    9.2/（10/3）
    20%+arctan（2.5*0.3-0.5）×20%/π
    (arctan(1/e))
    (arctan(e))
    (arctan(e)-arctan(1))
    (2/e)*(arctan(e)-arctan(1))
    (2/e)*(arctan(e)-arctan(1))
    (2/e)*(arctane-arctan(1))
    (2/e)*(arctan(e)-arctan(1))
    (2/e)*[arctan(e)-arctan(1)]
    (2/e)*[arctan(e)-arctan(1）]
    (1/e)*[arctan(e)-arctan(1/e)]
    (1/e)*[arctan(e)-arctan(1/e)]
    (1/e)*[arctan(e)-arctan(1/e)]
    ［1748×（1+0.0586）×1.0606×1+0］×0.9821
    ［1-1/（1+8.0%）^49.36］/［1-1/（1+8.0%）^70］
    sqrt(9)

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