arctan0.0714285
     arctan1/14
     arctan(1/14）
     arctan1
    arctan1/14
    900900990991/17
    900900990991/19
    900900990991/239
    900900990991/3451
    900900990991/79
    900900990991/53
    900900990991/333667
    900900990991/137
    900900990991/909091
    900900990991/11
    2702702972973/3
    100000010000001/37
    3--3
    -470000+77500*5.7590+147500*0.3855
    77500+50000+20000

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