arctanx=x
    2e^x-2cosx=0
    x^2-x-1=0
    x^2-7x-2=0
    2-lnx
    2-lnx
    sin2x*sin2x
    x^2-4x-3
    x2-2.025x+1=0
    0.57*{（x-sin（2πx）/2π）+（3x-1.25）*0.13}＝2/3*{（sin(πx）)^3/π}+0.13*470/650*{sin(πx)+sin(1.25π-2πx）}/π
    x*1.39=2.68
    x*1.39=3.66
    2*q=7
    √(x-7)＝√x-7
    x-5x^3+10=0
    1/2×x×sin(2π/x)
    16a^2等于9a^2+30a
    x2+(4√2-8)x+13-8√2
    x²+(4√2-8)x+13-8√2
    256(1+x)²=400

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