1/x=2.035lg（222600*x）-0.91
    1/x=2.035lg（632944.85*x）-0.91
    2400/a-50=400/a+2000/(a+2)
    xxxxx-2xxx-2x+1=0
    6387.84*(10.542*670/(0.1X+670)+33.31125)=5955.24*(14.28*670/(0.2X+670)+41.1075*670/(0.1X+670))
    6387.84*(10.542*670/(0.1X+670)+33.31125)=6228.84*(14.28*670/(0.2X+670)+41.1075*670/(0.1X+670))
    6387.84*(10.542*670/(0.1X+670)+33.31125)=6228.84*(14.28*670/(0.2X+670)+41.1075*(0.1X+670))
    （800+x-12168.93）x（1-25%）+5213.15=5634.18
    （800+x-12168.93）x（1-25%）+5213.15=5634.18
    11315496/(670+0.2x)+7543664/(670+x)+25931010/(670+0.1x)+17287340/(670+x)=9092034/(670+0.1x)+6061356/(670+x)+32734.8+14621554/(670+x)
    11315496/(670+0.2x)+7543664/(670+x)+25931010/(670+0.1x)+17287340/(670+x)=9092034/(670+0.1x)+6061356/(670+x)+32734.8+14621554/(670+x)
    11315496/(670+0.2x)+7543664/(670+x)+25931010/(670+0.1x)+17287340/(670+x)=9092034/(670+0.1x)+6061356/(670+x)+32734.8+14621554/(670+x)
    11315496/(670+0.2x)+7543664/(670+x)+25931010/(670+0.1x)+17287340/(670+x)=9092034÷(670+0.1x)+6061356/(670+x)+32734.8+14621554/(670+x)
    sin x=0.7198
    sinx=0.7198
    1000/（1+i）2+3000/（1+i）^3=3000
    25200÷(x+70)+8400÷(x+82)=142
    15200÷(x+70)+8400÷(x+82)+10000÷(x+60)=142
    x+2=0
    0.6×（1＋X）/ [12×（1－6%)]＋X＝11％

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