140t＾2＋60t－77＞0
    X^3-12*X^2+29*X+6<0
    3≤abs(8-x)
    x^4-1.36x^2-0.0412＜0
    100x^4-136x^2+3.9＞0
    12x∧2－43000x+228000≤0
    m^2-4m-4>=0
    （m-2）(m-2)>=8
    a^2＜1
    6-5>7-5
    -2x2+12x-18<0
    1*1+bx+4/1<0
    2x2+4>x2+6
    （x+1）(x-2)>(x+1)(-x+6)
    -37500+5700/(1+r)+12900/(1+r)^2+16300/(1+r)^3+27500/(1+r)^4＜-37500+17300/(1+r)+16200/(1+r)^2+13800/(1+r)^3+7600/(1+r)^4=0
    x2-5x+10＜0
    x*(1+x)^33>0.567
    4
    12<2-a<13
    2x<3(x-3)+1

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