x-x/1.13=75
    x-x/1.13=7500
    arctan(sin70/(1-cos70))
     X+X*0.06
    2000(1+10%)[-1+(1+10%)^120]/10%
    2000*12*[1-(1+0.1)^10]/-0.1
    2000*12*[1-(1+0.1)^20]/-0.1
    2000*(1+0.1)^240
    2000*1.1^240
    (2000*1.1)^240
    6.35884*e(-15)
    2.9259*e(-6)
    e(-10)
    4.92876*e(-29)
    e(-29)
    0.85*42X+0.15*15X=27500*0.5
    0.85*44X+0.15*15X=27500*0.5
    x^2-5x+6=0
    a^4-2a^3+a^2=3/48
    a^2（1-a）^2=3/48

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