(x+4)/0.2-（x-3）/0.5=-1.6
    x/195000+0.002*(x/1860)^13.5=0.04
    x/195000+0.002*(x/1860)^13.5=0.038
    x/195000+0.002*(x/1860)^13.5=0.036
    x/195000+0.002*(x/1860)^13.5=0.034
    x/195000+0.002*(x/1860)^13.5=0.032
    10（x+4）/2-10(x-3)/5=-16
    x/195000+0.002*(x/1860)^13.5=0.03
    (0.90154-x)*(0.29846-0.33106*x)^0.33106=(0.30518-x)*(0.89482-2.93208*x)^2.93208
    x/195000+0.002*(x/1860)^13.5=0.028
    x/195000+0.002*(x/1860)^13.5=0.026
    a*a+a=210
    256x^4＋68x^2－3＝0
    (0.29846-x)*(0.90154-3.02059*x)^3.02059=(0.89482-x)*(0.30518-0.34106*x)^0.34106
    1/d+1/(d+2)+1/(d+1)-1/(d+10)=0
    1/d+1/(d+2)+1/(d+1)-1/(d+10)=0
    (0.29846-x)*(0.90154-3.02*x)^3.02=(0.89482-x)*(0.30518-0.34105*x)^0.34105
    x/195000+0.002*(x/1860)^13.5=0.024
    x/195000+0.002*(x/1860)^13.5=0.022
    x/195000+0.002*(x/1860)^13.5=0.018

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