d∧2+4d-1=0
    d∧2+d＋3=0
    d∧2＋d＋3=0
    1/d＋1/(d＋2)+1/(d＋3)=1/(d＋5)
    3d∧2＋14d＋10=0
    3d∧2＋14d＋10=0
    3d∧2＋14d＋10=0
    32.5/(x+100)=24.6
    x+1.5x+1.75x=14
    x=76600+1.33%x
    x=76100+1.33%x
    1.235=（（0.021*x^1.85+1603）^0.5）*x^0.84
    0.235=（（0.021*x^1.85+1603）^0.5）*x^0.84
    0.0235=（（0.021*x^1.85+1603）^0.5）*x^0.84
    164=（（0.021*x^1.85+1603）^0.5）*x^0.84
    x=70900+0.0672x
    x^3+2x^2-1=0
    x*3+2x*2-1=0
    x²-x=870
    28500000=14.3*1000*x*(124-x/2)

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