6800*（1+7.5%/4）^8-6800=
     6800*（1+7.5%/2）^4-6800=
    2800*（1+9%/12）^36=
    2800*（1+9%）^3=
    7000*{(1+12%)^0.5-1}
    7000*(1+12%)^0.5-7000=
    cos135
    cos45
    cos45
    73260.07+83859.97+92153.82+126584.91+128800.28-250000
    792-489
    1-2/5
    1-1/5
    90-arctan0.63-arctan3.15
    arctan3.15
    arctan0.63
    90-arctan0.62-arctan0.62×5
    8/（1+0.05）+100/（1+0.05）^5
    arctan0.7+arctan0.35=
    8/（1+0.05）+100/（1+0.05）^5

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