284/31*x+170.5/31*(x+15)+86.5/31(x+30)=1277
    x^5=x^x
    (1.56166e-10)*x^5 - (1.267e-8)*x^4 + (7.04565e-6)*x^3 + 0.0227*x^2-500
    (1.56166*e-10)*x^5 - (1.267*e-8)*x^4 + (7.04565*e-6)*x^3 + 0.0227*x^2-500
    x^4-（x-0.02）^4=0.6094848
    46x²＋92x－80＝0
    0.25*x^3+1.375*x^2+2.5*x+1=0
    0.25*x^3+1.375*x^2+2.5*x+1=0
    (1.2+x)*1.5/2=2.7
    (1.2+x)*1.5/2=2.7
    （200-5x）（2+x）=640
    X²-100X+250
    (16-m)^2+64=m^2
    12.18x=（3.2+x）×7.98
    2x-3x^2＝-40
    2x-3x^2＝-40
    2x-3x^2＝-40
    2x-3x^2＝-40
    2x-3x^2＝-40
    2x-3x^2＝-40

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