(x-9.5)/x=0.5
    (x-5.075)/x=0.5
    (x-7)/x=0.5
    (x-5.5)/x=0.5
    (x-5.5)/5.5=0.5
    1.5x^2=22
    15%=(x-1.23)/x%
    x-15/x=1.23
    480x-100(x+1)=50(7x+1)
    x^{3}+2x^{2}+x+4
    25+x＝33.60+149.186-x
    25+x3＝33.60+149.186-x
    25+x＝33.73+149.55-x
    25+x²=（10√3+1）x
    25+x²=（5√3+1）x
    x*sqrt(1-2*0.27^2)=45.3
    x*sqrt(1-2*0.27^2)=sqrt(45.3)
    x*sqrt(1-2x^2)=sqrt(45.3)
    lgx=1.5
    20lg(1/(2*x))=-6

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