（1+x）0.0135x=1
    ln(1+54.7x)-54.7x=ln(1-3.97)-0.074
    m*(m+2)/(m-1)+m^2+2*m=0
    80*x*x+384x+576＝90
    （x-3000*8.8%)/1200=(x-3000*8.8%-1000*10%)/1000
    21.6X-21.6x（X+3）=0.1
    2x^2+2x-1=0
    m*(m+2)/(m-1)+m^2+2*m-3=0
    3927
    ((x-3000*8.8%)*(1-25%))/1200 =((x-3000*8.8%-1000*10%))*(1-25%)/1000
    m^3+2*m^2-3*m+3=0
    69x^2-100x+36＝0
    xxxx-8xx＋4＝0
    （x-3000*8.8%)*(1-25%)/1200=(x-3000*8.8%-1000*10%)*(1-25%)/1000
    （x-3000*0.088)/1200=(x-3000*0.088-1000*0.1)/1000
    2x－1／3－5x+1≤1
    4.302/3.175
    x／2＋2≤x/3-1
    1.2(5/3)
    x^(2)-19x+176=0

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