2*x/(x^2+2)+1/4
    ln(x^2+2)-4*x
    ln(x^2+2)-x/4
    ln(x^2+2)+x/4
    0.0064*0.25+0.25*x^2+0.16*0.25*x=4x^2-0.96x+0.0576
    e^x+3*x
    ln(x^2+2)+4*x
    2.5x /（1-2.5x)=10%
    ln(x^2+4)+x/4
    ln(x+2)+x/4
    log(x)-x/4
    ln(x+2)-x/4
    ln(x+2)-x/4
    2/3*((1-1/0.17)+(3/4+1/0.17)*(1/3*215/x*0.35805183739485175)^0.17)=7.94/x
    2/3*((1-1/0.13)+(3/4+1/0.13)*(1/3*215/x*0.35805183739485175)^0.13)=7.94/x
    2/3*((1-1/0.1)+(3/4+1/0.1)*(1/3*215/x*0.35805183739485175)^0.1)=7.94/x
    2/3*((1-1/0.1)+(3/4+1/0.1)*(1/3*215/x*0.35805183739485175)^1)=7.94/x
    2/3*((1-1/0.07)+(3/4+1/0.07)*(1/3*215/x*0.35805183739485175)^0.07)=7.94/x
    2/3*((1-1/0.05)+(3/4+1/0.05)*(1/3*215/x*0.35805183739485175)^0.05)=7.94/x
    2/3*((1-1/0.03)+(3/4+1/0.03)*(1/3*215/x*0.35805183739485175)^0.03)=7.94/x

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