x²+2x-27.192＝0
    x²+2x-21.588＝0
    x²+x-20＝0
    0.21 - 0.1[30x - (0.1 + x)] = 0.5x - 0.1[6x - (0.1 - 7x)]
     -17*(x-39)^2*x^4*(x+1)^2/3125000 + (x-39)*x^3*(x+1)/8750 + x^2*(x+1)/625 - 8*(x-1)^2*x^3*(x+1)/31250 + (x-1)*x^2*(x+1)/375 - x^2*(x+1)/625 + x^4*(x+1)/6250
    12x²-14x+3=0
    x^2-10x+40=0
    tanx-x=0.35
    tanx-x=20
    lg(4.571*10＾-5)=-1.1-1.4+lgx
    lg(1.481*10＾-5)=-1.1-1.4+lgx
    lg(5.124*10＾-6)=-1.1-1.4+lgx
    lg(5.124*10＾-6)=-1.1-1.7+lgx
    y2-2500y+997500=0
    x^3-61x^2+510x-9=0
    x^2-101x+84=0
    49*x*x-49*130*x+400*130
    24÷（6/ x2）
    24÷（6/2x）
    (1/(1-x))*ln(20-19*x)=3.41

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