10000000+20000000*0.5=
    10000000+2000000*0.05=
    （6.59-5.2）/5.2
    10000000*0.13/1.3=
    arctan(3)
    3^2.2
    3^1.2
    2^-3.2
    2^-3 2
    90-arctan0.40776-arctan2.038
    -3000000+(500000/12%)*(1-1/(1+12%)^7=
    -500000+(150000/12%)*(1-1/(1+12%)^7)=
    -500+(150/12%)*(1-1/(1+12%)^7)=
    -500000+(1500000/12%)*(1-1/(1+12%)^7)=
    -500000+1500000/12%*(1-1/(1+12%)^7)=
    1-1/(1+10%)^7=
    sqrt（sqrt（36）+7）=
    (1+10%)^7=
    (11+10%)^7=
    -1/3-1/4

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