（135567+x）/2*38.15*0.01=6832.62
    ln(x/0.0544)/(x-0.0544) = 2.5
    2t^3=(4-t^2)^3-3(4-t^2)^2
    40m+2m−6+12m=5
    ln(x/0.0481)/(x-0.0481) = 2.5
    ln(x/0.0481)/(x-0.0481)=2.6
    ln(x/0.0481)/(x-0.0481)=1
    896+1/2x＝x
    x*3.99=2.43
    cot68.5658
    cot68.5658
    cot68.5658
    1=0.98*（1-x×x）/x+0.8/x
    671*1.1/(0.75－x)*15*5*1.1=1000000
    671*1.1/0.75x*15*5*1.1=1000000
    671x*1.1/0.75*15*5*1.1=1000000
    13.24x=（3.5+x）×8.97
    13.24x=（3.5+x）×8.96
    13.24x=（3.8+x）×8.96
    0.0265=x/（200+x）

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