2520000000=14.3*500*x*(1130-x/2)+360*1964
    [(p+1)(7p+3p*3p-6)]/6+(7p+3p*3p-6)/3p*3p+[8(7p+3p*3p-6)/9p]=2/3+p-2/p
    x
    x
    x
    3.14/(x*sqrt(1-(0.707)^2))=3.14
    e^(-3.1415926x/sqrt(1-x^2))=0.043
    e^(-3.14x/sqrt(1-x^2))=0.043
    x2-6.1x+8.6=0
    20*sqrt(1+(66.6x)^2)/(x*sqrt(1+(888x)^2)*sqrt(1+0.25x^2))=1
    20*sqrt(1+(66.6x)^2)/(x*sqrt(1+(888x)^2)*sqrt(1+0.025x^2))=1
    90-arctan(0.5x)+6=60
    90-arctan(0.5x)=60
    x/（100-x）=6.2
    lgx＝0.15
    （x-31.25/x=0.2
    （x-36.79)/x=0.2
    4x+6x²-1=0
    （x-268.94)/x=0.2
    1607.68=(3/5*x)/(0.8*300)

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