3.3/(75+x)x=1.28
    3.3/(75+x)x=1.25
    0.13x+x = 13532
    (10-2*x)^2-4(2*x^2-4*x-2)>0
    (10-2*x)^2
    8y+y=3.6
    4*(k+1)^2-4*k*(k-1)
    (-m-1)÷(6-3m)=4
    x^2-4>5x+2
    -x^2+2x+3 = 0
    -x^2+2x+3
    （x-1）^2>0
    2/3x^2-4/3x-2<0
    4.053*10000000-4.053*10*39.13*x+0.1408*x^2-0.1408*39.13/1000000*x^3=2271.106*x
    1/(x-1)^2>1000
    1/(x-1)^2>10
    1/(x-1)^2>100
    x（x+1）大于0
    3x2-10x+7＞0
    （m-1)(m-2)<=0

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