X=(20676.84+(665000*X)+((20676.84+(665000*X))/930000)*(-665000)+61944.65)/(552602)
    x^2=(x-8)^2+4^2
    X=(20676.84+(665000*X)+((20676.84+(665000*X))/930000)*(-665000)+61944.65)/552602
    X=(8581.48+665000*X+((8581.48+665000*X)/930000)*(-665000)+28826.6)/552602
    X=(20676.84+665000*X+((20676.84+665000*X)/930000)*(-665000)+61944.65)/552602
    648.039=16.1×1400×a×（705-a/2）
    648.039=16.1×1400×x×（705-x/2）
    x²+5x-45*50=0
    x²+5x+45*50=0
    450/x-450/（x+5）=1
    450/x-450/x+5=1
    2050=0.488×50×(2×9.81)^(1/2)×x^(3/2)
    1680=0.488×50×(2×9.81)^(1/2)×x^(3/2)
    1420=0.488×50×(2×9.81)^(1/2)×x^(3/2)
    3^x-(1/3)^x=1
    3^x-(1/3)^x
    3^x-3^(-x)
    1.2*(90+14*0.5+8+0.05x+0.03)=x
    (3a-3)(1+(1/3)a)=2a
    x+x/11.3=235200

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