24a^2+62a*14=0
    （（x-40-48）*（1-0.2）/600）=（（x-40）*（1-0.2）/700）
    20lgx=12
    20lgx=-12
    100*sqrt(1+x^2)/(xx*sqrt(1+100x^2)*sqrt(1+(x/50)^2))=1
    x^2-7.1x+ 10.8=0
    lg(x/0.1)=3
    9x²－5＝3
    lgx=30
    lg(x/0.1)=30
    x^2-11.0x+20.0=0
    9x－5＝3
    26-x=20lg0.5
    180-90-arctanx-arctan(0.1x)=60
    26/lgc=40
    arctan(x/5)-90-arctanx-arctan(x/100)=-180
    100*sqrt(1+0.04x^2)/(x*sqrt(1+x^2)*sqrt(1+(0.01x)^2))=1
    2.5=x*sqrt(1-0.25^2)
    20lg(1/(2x*sqrt(1-x^2)))=6
    66.7*x/2000/100 = 0.05

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