0.01x=1/60x-3
    5/(1+X)+5/(1+x)^2+105/(1+x)^3=97.3
    5/(1+X)+5/(1+x)^2+105/(1+x)^3=97.3
    5/(1+X)+5/(1+x)^2+105/(1+x)^3=97.3
    1-2/3x-(1-x)^(2/3)=0.062
    x^(2/3)-(2/3)x=0.272
    -90-arctan(0.5x)-arctan(0.1x)=180
    10x+（15-X）*5=120
    8400/(x+112*0.32)+10000/(x)+10000/(x+112*0.2)=150
    x/100=x-100/60
    X-0.3x-0.06x=16
    3（x－4）＝x
    17.8-(3x-6)=5.8
    2x^2+x+8=0
    1.25x^2-6x+7.2=0
    8400/(x+112*0.12)+20000/(x+112*0.2)=150
    8400/(x+112*0.12)+10000/(x+112*0.2)+10000/x=150
    3x－1＝-3
    7600/(x+112*0.12)+10000/(x+112*0.2)+10000/x=150
    7x＾2+20x-230

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