（39.402+x）×2.35＝39.402+72.104-x
    （39.402+x）×2.2＝39.402+72.104-x
    （39.402+x）×2.05＝39.402+72.104-x
    2=0.1*[（a*a）/4]
    0.949x-0.107sin(2πx)-0.1159=0.21(sin(πx))^3+0.038sin(πx)+0.038sin(1.25π-2πx)
    x^3-2*x^2+4=0
    (1.11^(1/0.22))*x*(1-0.22/2.22*x^2)^(1/0.22)=1/40
    x^2-22x-80＝0
    1210*t+100*(120-t)=123000
    0.793x-0.089sin(2πx)-0.097=0.21(sin(πx))^3+0.038sin(πx)+0.038sin(1.25π-2πx)
    7x+2(x+20)=760
    7x+2(x+20)
    x^x=x²
    3x=π
    x-2=2x
    x-2=2x²
    x-2=x²
    2x-8=x²
    20lg0.01x+0.002x=14
    (x-15)(-2x+90)=400

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