2.5（x-3.5）^2+x=5
     2.2477*x=x+1000
    0.0427x2+0.0929x+1.3332 = 1.3699
    0.0427x2+0.0929x+1.3332 = 1.3699
    0.0427x2+0.0929x+1.3332 = 1.3659
    0.0427x2+0.0929x+1.3332 = 1.3359
    x-10/10-10%=1.1x-12/12
    0.0427x2+0.0929x+1.3332=1.3659
    5.95x^2-3153.5x+212400=0
    0.3835*{（x-sin（2πx）/2π）+（3x-1.25）*0.13}＝2/3*{（sin(πx）)^3/π}+0.13*495/550*{sin(πx)+sin(1.25π-2πx）}/π
    x*x*x-2*x*x+1
    x*3.99=3.67
    x*4=3.67
    x*1.61=3.67
    !(x)=24
    ex^-1
    10x*x=64
    x²-3x-6＝0
    0.393*{（x-sin（2πx）/2π）+（3x-1.25）*0.172}＝2/3*{（sin(πx）)^3/π}+0.172*504/550*{sin(πx)+sin(1.25π-2πx）}/π
    27/13=(80-x)/(x-70)

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