(340*2040*2*x)/(340^2-x^2)=3
    x+8≥4x+1
    2x×x-5x-3＝0
    （x^2+3X+3)(1+x)^8=3.811
    4x（x+1）＝3+3x
    3x^2-12x+10
    4x^3=0.125*(2-3x+x^3)
    235x/(235x+238*(2.0959-x)) = 70%
    235x/(235x+(2.0959-x))=70%
    3+2x=15
    1=((6+3^(1/2))/5)*x^2
    x^2+120x-2025=0
    73219.35=(10000000*x*(1+x)^60)/((1+x)^60-1)
    73219.35=10000000*x*(1+x)^60
    x^2+115x-2400=0
    125(1-x)^3-30(1-x)+4=0
    (7148497.50+X)*0.2/1.05*0.05=X
    13994.2062=22400*2.25x（1.5618-x/2）
    (7148497.5+x)*0.2/1.05*0.05
    1.4x3十0.7X=5.6

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