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
    2x-3x^2＝-40
    2x-3x^2
    e＾x=1/x
    （3+s）∧3=（s＋1）（3s∧2+18s＋27）
    94000x+47000x^2=7820.80
    X-[X/1.03*0.03+X/1.03*0.03*0.12]=124290

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