20lg(1/(2x*sqrt(1-x^2)))=8
    180-90-arctan10x-arctan0.1x=30
    x*sqrt(1+100x^2)*sqrt(1+0.01x^2)=10
    x²+x＝1
    x^4+x^2-400=0
    【（260+220）*63-x】*0.85+18*63=26178.65
    x2-5=10
    x.22%=147
    (x^2-x*2)+(x-17)(x-77)=0
    0.130/x＝0.1289/0.86289
    0.4/100.58＝x/32.7
    （0.75X-461.25-240）/500=（0.75X-281.25-240）/750
    (800-a)*(1200+0.2a)=854000
    3500*x^2=2835
    15.7*sqrt(1+64x^2)/(x*sqrt(1+(x/0.5)^2)*sqrt(1+(x/22)^2))=1
    (36-x)/(lg0.5-lg8)=-40
    (-12+21)/(lg8-lgx)=-20
    20lg(x/0.25)=36
    20lg(16/x^2)=36
    2*sqrt(1+(0.05x)^2)/(x*sqrt(1+(0.01x)^2))=1

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