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）
    1-㏑X
    (1192x+1192*1.27)*1.4*3.3*10=1000000
    (1159+1159*1.16+1200)*1.15*20/1.5*2.2x=150000

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