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    1/2-2x(sqrt(1-x^2))=x
    x÷3+x÷4=420
    【(x-10000*6%-4000/1250*1000*9%)*(1-25%)-6000*10%】/1000=[(x-10000*6%)*(1-25%)-6000*10%]/1400
    【(x-10000x6%-4000/1250*1000*9%)*(1-25%)-6000*10%】/1000=[(x-10000*6%)*(1-25%)-6000*10%]/1400
    lnx+2/x-2=0
    lnx+2x-2=0
    lnx+x/2-2=0
    lnx+2/x-2=0
    (x−300)×0.75/3300=【(x−300)×0.75−75】/3150
    (x−300)×(1−0.25)/3300=((x−300)×(1−0.25)−75)/3150
    0.237*sinx/cos(x-5)+0.01+0.01*sinx=0.237
    2*x^3-2*x^2-17*x-4=0
    m*m-3m-8=0
    2640=[X*(0.9-0.4)-(4000+2000+1200)]*(1-25%)
    [X*(0.9-0.4)-(4000+2000+1200)]*(1-25%)=2640
    [X*(0.9-0.4)-(400+200+1200)]*(1-25%)=2640
    2640=[X*(0.9-0.4)-(400+200+1200)]*(1-25%)
    2640=X*0.5-7200*0.75
    X÷5000-1.5X÷6000=2
    1/√x=1.74-2lg(0.01+18.7/22031*√x)

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