a*0.06328=cos(1/(a*3*5))
    a*0.06328=cos(1/(a*2*5))
    a*sina=0.628.3
    x*sinx=632.8
    xx+7x+12=0
    4x^4-3364x^2+453265=0
    2x^2-140x+1875=0
    15（x+45）=20x
    579.5=0.0373*x^0.66
    0.15x^2+1.2x+1=0
    100*(((1+x)^12)-1)/(x*(1+x)^12)=1000
    (92+96+97+300+x)/7=94.5
    (92+97+300+x)/7=94.5
    20lg10-40lg(x/2)-20lg(0.25*x)=0
    20lg10-40lg(x/2)=0
    -arctan(0.25*x)-arctan(0.4*x/(1-(x/2)^2))=-180
    （1+r）^2=1.75
    x = 1/(100/(0.38*√((1-0.38^2)+0.38^2))*√(36*(0.38^2)-1) )
    x=1/(100/(x*√((1-x^2)+x^2))*√(36*(x^2)-1)
    20lg100-20lg6*x-20lgx-40lgx=0

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