x/12*7=9997
    8000/(0.32×112+x)+10000/(x)+10000/(x)=150
    8000/(0.12×112+x)+10000/(112×0.2+x)+10000/(x)=150
    7600/(0.12×112+x)+10000/(x)+10000/(x)=150
    7600/(0.12×112+x)+10000/(112×0.2+x)+10000/(112×0.2+x)=150
    7600/(0.12×112+x)+10000/(112×0.2+x)+10000/(x)=150
    7600/(0.12×112+x)+10000/(112×0.2+x)+10000/(x)
    1337*（1+x^2）/（1-x）=1961
    353*（1+x^5）/（1-x）=1961
    502*（1+x^16）/（1-x）=6246
    lgx=0.04
    X^2+250X-4500000=0
    5/14x=1/7
    9x-3.8x=18.72
    （1＋x）∧10＝1.6689
    5/14x=1/7
    （1＋x）＾10＝1.66897
    xx+860x-48000
    x×0.97=14623.09
    25X+（x-200）*25=15000

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