(60-2X)x12x305x2+16x(120-2x12)x305=Xx12x400x4+(120-2x12)*12x400x2
     1.6 = a+2.5
     1.6 = a+2.5
    1.6=a+2.5
    x=722.72-822.60×0.089x^(1÷3)
    x=725.33-845.70×0.076x^(1÷3)
    （X+19816.1-5588-25000）*0.03=X-15202.5-1117.6
    （X-977.6-5000）*0.03=X-10776-977.6
    x2=lnx
    x*x=lnx
    （X-977.6-5000）*0.03=X-10776-977.6
    x=lnx
    （X+20000-5588-25000）*0.03=X-18773.6-1117.6
    （X+20000-5588-25000）*0.03=X-18773.6-1117.6
    （X-1117.6-5000）*0.03=X-18773.6-1117.6
    （X-1117.6-5000）*0.03=X-18773.6
    2x+4（14-x）＝38
    X÷6/35=7/10
    x*x+x＝24
    a^3-57a^2+1600a-18432=0

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