（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
    20lgx=13.98
    20lgx=26
    x*x-1.5*x+0.5=0
    100sqrt(1(x/5)^2)/(x*sqrt(1+(x/0.28)^2)*sqrt(1+(x/100)^2))=1
    arctan(x/5)-90-arctan(x/0.28)-arctan(x/100)=-180
    xx-9x+25=7
    （27.4-x）/x=0.132

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