690m^2-828m+690=2116m^2-4232m+2116
    0.1824x^2-110x+2690=0
    a^4+2a^3-6a^2+2a-7=0
    90.44/（90.44+x）=0.03
    2.74（1+x）=74.3(x-0.15)
    s^3+5s^2+5s-4=0
    300=-16[(25-5√13)/2+a]^2+800
    2s^3+11s^2+20s+10=0
    -4t^2+100t=300
    x^3=2
    x^3=2
    a²+a-13=0
     59x+x² = 2400
    2s^3+13s^2+20s=0
    x3+x-2＝0
    sin(x)-cos(x)-x
    4.43=x/633
    17.16=x/1733
    17.16=x/1733
    4.82%*x=4.43

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