(i-7%)/(8%-7%) = (4-4.1002)/(3.9927-4)
    (i-7%)/(8%-7%)=(4-4.1002)/(3.9927-4)
    (i-7%)/(8%-7%)=(4-4.1002)/(3.9927-4)
    sin x=2
    -10lg（1-x）=5
    -10lg（1-x）=3
    8000/(x+12.12)+10000/x+5500/x=150
    -10lg（1-x）=2.4
    -10lg（1-x）=2.3
    -10lg（1-x）=3
    -10lg（1-x）=2.5
    -10lg（1-x）=2
    -10lg（1-x）=1.5
    -10lg（1-x）=0.8
    -10lg（1-x）=0.6
    8000/(x+13.44)+10000/(x+22.4)+10000/(x+22.4)=150
    -10lg（1-x）=0.4
    （X-800）*0.2=X-2500
    -10lg（1-x）=0.3
    7600/(x+13.44)+10000/(x+22.4)+10000/(x+22.4)=150

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