4/2m-2<0
    2.5-8.625*(x-0.43)^2>x-0.43
    k-3＞k^2+1
    -(1/8)(x^2-32x-480)≥80
    3x-2>1
    -1/3<1/X<3
    1/X<3
    （4a+1）÷（a+1）＜3
    -2
    x/x>0
    （2+lga）lga-3≤1000
    a^（2+lga）≤1000
    a^2+lga≤1000
    (x-1)/(x+1)>0
    0
    1
    1+2/5x＞2x-4
    (48-t)*20+t*80 <=2000
    3x+7-5x+3≥-3
    (3x+7)-(5x-3)≥-3

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