5w^2=(w^2+1)^2
    tan36
    ((X-10000*6%-4000*9%)*(1-25%)-6000*10%)/1000=((X-10000*6%*0.75-600)/(1000+400)
    tan 36
    ((X-10000*6%-4000*9%)*(1-25%)-6000*10%)/1000=((X-10000*6%)*0.75-600)/(1000+400)
    2/5x +1/5x =30
    x^(2)-2x+1=0
    x^(2)+0.275x-100=0
    tanX=12/5
    80y-20=100-20y
    6(x－2）＝12
    9m/2+24=-3m/4^2减41/12m
    （X-2)^2+(-3X/4+15)^2=100
    9m/2+24=-3m/4^2减41m/12
    x^3+20x^1.5-20x=1000
    4（1.5x+2）＝80
    ln(1/(0.11-x)/(0.11-x)*(0.15-x)*(0.2-x))=0.28/(2-x)
    xxx+20xx-20x=1000
    x^3-6*x^2+1=0
    (0.28*x-0.001)/(0.31-x)/(0.7-x)=ln((0.11-x)*(0.11-x)/(0.15-x)/(0.2-x))

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