20/(x*sqrt(1+(0.5x)^2))=1
    x=（1-x)（5-x）^10
    20lgk=21
    x*sqrt(1+x^2)*sqrt(1+(x/50)^2)=20
    90-arctan(x)-arctan(x/50)=30
    -90-arctan(x)-arctan(x/50)=-180
    90-arctan(x)-arctan(x/50)=-180
    （7-10x）(1-x)=x
    （5-10x）(1-x)=x
    19x×24=17x×30
    (X+300)*1.1=2299
    1.3*(X+300)=2299
    （26.448+x）×2.35＝52.895+71.643-x
    X*X+4.31*X=0.0022
    3*(2/5y-11)+5y=21
    3*2/5y-11+5y=21
    cos(t)=0.95
    X∧2+4.31*X=0.0022
    x^2-82*x+81
    -2x^2+x+1

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