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    x^4+10x^3+20x-4=0
    5.13=【37.1598×1.0188(X+0.1)】÷【1+1.0188×(X+0.1)】×【(100-15.51%-2.93)÷100】×【1÷(1+0.31×2.93)】+【8.33%×(X+0.1)】÷【(1.32×0.101325)】
    25^y=15
    9^x=15
    sin2x-sinx
    2950÷X×104=1763
    x*x+0.01x+0.00002=0
    480/x = 240/x+(1/3)+180x+(2/3)
    480/x=240/x+1/3+180x + 2/3
    480/x-240/x-1/3-180x=2/3
    x-1=0
    240-1/3x-180x²=2/3x
    180x²+x-240=0
    4*sqrt(1/4+x*x)-x=3+1/2
    X/200+(17.5-X)/500=0.03
    ln2x/lnx=2
    ln3x/lnx
    x一[(x一27)+(x一25)]=3
    2000*(22-x)=2400x
    1/2=1200x/2000*(22-x)

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