x^2*1.45286*10^-6-x*7.83213*10^-4+1.42185=1.3890
    x^2*1.45286*10^-6-x*7.83213*10^-4+1.42185=1.3839
    x^2*1.45286*10^-6-x*7.83213*10^-4+1.42185=1.3726
    x^2*1.45286*10^-6-x*7.83213*10^-4+1.42185=1.3715
    x^2*1.45286*10^-6-x*7.83213*10^-4+1.42185=1.41
    x^2*1.45286*10^-6-x*7.83213*10^-4+1.42185=1.3604
    0.82x-0.1305sin（πx）+0.3198x-0.13325= 0.2122(sin（πx）^3)+0.0374sin（πx）+0.0374sin（π（1.25-2x））
    2.068=（（0.021*x^1.85+150.5）^0.5）*x^0.84
    （40.221+x）×1.55＝40.221+71.572-x
    （40.221+x）×1.55＝40.221+71.572+x
    18%×X+13%(1-X)=16%
    2.5*2.5+3*2.5-4=x-4
    -4=2.5*2.5-3*2.5-4+x
    acttan（1/11）
    7×x^2-12×x+18.9=0
    7×y×y+7×4.41×4.41-18y=0
    X²-50x-5600=0
    0.0495x^2+1.135x-4.79204
    -2x²+220x-4800=800
     8.586x-0.89sin(2*180*x)=1.25

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