160/(1+10%)+110/(1+10%)^2+160/(1+10%)^3
    (110-200)/(1+10%)+(50-90)/(1+10%)^2+(110-200)/(1+10%)^3
    160/(1+10%)+110/(1+10%)^2+160/(1+10%)^3+110/(1+10%)^4
    (110-200)/(1+10%)+(50-90)/(1+10%)^2
    160/(1+10%)+110/(1+10%)^2+76/(1+10%)^3
    (110-200)/(1+10%)+(50-90)/(1+10%)^2+(30-50)/(1+10%)^3
    160/(1+10%)+110/(1+10%)^2+76/(1+10%)^3+40?(1+10%)^4
    ln(863/4057)
    arctan0.12
    （0.5+50）*10^(-0.2213/0.059)
    （0.5+50）*10^(221.3/0.059)
    （0.5+50）*10^(-221.3/0.059)
    log（0.5,π）=
    log（2,π）=
    sin73
    2^3^4
    log（10,log（10,100000000））
    log（10,10000000000）
    （200000-1）/400000
    5.16%*3132/(3132+90000)

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