2x=3+8
    -3/4x^2-9/4x+3=0
    11x+1=5（2x+1）
    n(n-1)=72
    x*（50-42）-60000=x*（50-40）-90000
    x^2-6x+8=0
    （x-180）*120000-7200000=14800000
    （300-180）*100000-x=8000000
    （300-180）*100000-x=8000000
    0.51*{（x-sin（2πx）/2π）+（3x-1.25）*0.12}＝2/3*{（sin(πx）)^3/π}+0.12*490/550*{sin(πx)+sin(1.25π-2πx）}/π
    15/x-4/1=10/1.5x
    15/x-4/1=10/1.5x
    15/x-4/1=10/1.5x
    15/x-4/1=10/1.5x
    15/x-4/1=10/1.5x
    0.47x-0.0748sin（πx）+0.2256x-0.094 = 0.2122（（sin（πx））^3+0.0448sin（πx）+0.0448sin（π（1.25-2x））)
    0.47x-0.0748sin（πx）+0.2256x-0.094 = 0.2122(（sin（πx））^3+0.0448sin（πx）+0.0448sin（π（1.25-2x））)
    0.47x-0.0748sin（πx）+0.2256x-0.094 = 0.2122(（sin（πx））^3+0.0448sin（πx）+0.0448sin（π（1.25-2x））)
    0.47x-0.0748sin（πx）+0.2256x-0.094 = 0.2122(（sin（πx））^3+0.0448sin（πx）+0.0448sin（π（1.25-2x））)
    0.47x-0.0748sin（πx）+0.2256x-0.094 = 0.2122(（sin（πx））^3+0.0448sin（πx）+0.0448sin（π（1.25-2x））)

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