arctan(sqrt(x^4-1))+90=180+45
    arctan(sqrt(x^4-1))+90=-45
    arctan(sqrt(x^4-1))+90=45
    -0.8*57.3*x-arctan(x)=-180
    -0.8*57.3*sqrt(x^2-1)-arctan(sqrt(x^2-1))=-180
    sqrt(1+x^2)*sqrt(1+(0.5x)^2)=7
    sqrt(1-x^2)*sqrt(1-(0.5x)^2)=7
    sqrt(1-x^2)*sqrt(1-0.25x^2)=7
    (1.5-x)x=0.5
    20lg(2x*sqrt(1-x^2))=-8
    20lg1/(2x*sqrt(1-x^2))=8
    19x²-225x-650=0
    1/x+1/(1+x)+1/(3.5+x)=0
    63061600*(1+X)^6=102865000
    （24009.62-X/1.01*0.01）*1.12=273535.59-X
    5.88x-0.9x*x+100=0
    （26.326+x）×0.85＝52.652+76.778-x
    （26.326+x）×0.85＝52.652+75.778-x
    （26.326+x）×0.85＝52.652+74.778-x
    （26.326+x）×0.85＝52.652+73.778-x

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