x^2-45x+1600=0
    -2√1-x=x×-0.017102903716345
    -1.553283×x=2.518488301767225
    -2√1-x=x×-2.595809078401005
    -2√1-x=x×-2.518488301767225
    （5-a）（80−5a）+（2.5-0.5a）80
    2.1443=（（18.92*0.76（x+0.1））/（1+0.76（x+0.1））*（（100-18.25-1.35）/100）*（1/(1+0.31*1.35）+（（2（x+0.1））/（1.47*0.101325））
    2x^3-x^2+2=0
    x-x*0.4-x*0.03-x/20.27*0.16-4423.07-38500-5000-593.86-1050=0
    1.3x-1.3x*0.4-1.3x*0.03-1.3x/20.27*0.16-4423.07-38500-5000-x-593.86-1050=0
    1.2x-1.2x*0.4-1.2x*0.03-1.2x/20.27*0.16-4423.07-38500-5000-x-593.86-1050=0
    1.1x-1.1x*0.4-1.1x*0.03-1.1x/20.27*0.16-4423.07-38500-5000-x-593.86-1050=0
    1.1x-1.1x*0.6-1.1x*0.03-1.1x/20.27*0.16-4423.07-38500-5000-x-593.86-1050=0
    sqrt（5）x+2x=8
    lnx=x
    16-X=X+4
    1.1x-1.1x/20.27*4.91-1.1x/20.27*2.3-1.1x*0.03-1.1x/20.27*0.16-4423.07-38500-5000-x-593.86-1050=0
    5x^2-40x+32=0
    6x+x=120
    A×3.2%/360×90+A=2.016

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