2*x^2-3*x+3
    x^2-1>-x^2+3*x-2
    (100-x)×x+2500≥5000
    (100-x-20)×x+1600≤(2500/9)+1600
    (x-3)^2＞(x-2)(x-4)
    (x-3)^2
    (x^2+1)-(x^4+x^2-2x)
    x^4+x^2+2x
    2x^-1+2x^-2+2x^-3 <=1
    x^-1+x^-2+x^-3<=1
    99>2x+7
    (100-x)/x=0.08
    100-x/x=0.08
    100-x=0.08x
    1x=1.35/0.00035
    1x=1.35/0.35
    9k^2-6k+1＞0
    24049.28=x(1+3%)
    x^2<0
    (x-5/2)^2<0

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