x-12
    x-12<1
    （X*1.13-0.42*1.13)/(X*1.13)
    （4-4/5m*m+24/5m-4）*5-10-m（4-4/5m*m+24/5m-4）/2-（5-m）（4-4/5m*m+24/5m-4）/2≥0
    （X－20）（－2X＋80）＝150
    （X－20）（－20＋80）＝150
    1/(1+a)/(1+a)≥4*a*a/(9*a*a-9)
    -3*x^4+10*x^3+20*x^2-40*x<0
    -3*x^4+10*x^3+20*x^2-40*x+29<0
    x+3/x-4<0
    -3*x^4+10*x^3+20*x^2-40*x+30<0
    -3*x^4+10*x^3+20*x^2-40*x+31<0
    -3*x^4+10*x^3+20*x^2-40*x+32<0
    （2x-3）*（x-1）<0
    （2x-3）*（x-1）＞0
    7n^2-43n-4670>0
    k*k-72k+900≥0
    k*k-132k+324≥0
    -43*30+7*30^2
    -43n+7n^2>4670

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