200×π×x^3-3.6×x-4.07＝0
    200×π×x^3-3.6×x-12.2＝0
    200×π×x^3-3.6×x-0.84＝0
    0.923942882*x^-0.078099669+7-7.907147872*x^-0.018733344-0.015946818=0
    x^2+3=0
    x^2-4+1=0
    x^2-4=0
    (1365＋x)×0.04＝x
    x*0.9=889480.62
    0.015946818=(1-0.076057118)*x^-0.078099669+7-8*(1-0.011606516)*x^-0.018733344
    sinx-x-1
    x^3-x^2-12
    sinx=x-1
    X/126-(75-X)/1000=0.119
    sin（sinx）
    x/2*0.2=10000/x*40
    x/2
    746x*1.16*25/1.16*3=2750*40
    746x*1.16*25/1.16*3=2750*40
    746x*1.16*25/1.16*3=2750*40

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