(7*t^2 - 1)*(7*t^2 - 6*t + 1)>0
    (14*t - 6)*(7*t^2 - 1) + 14*t*(7*t^2 - 6*t + 1)>0
    x^2－89x+1600＜0
    x-1/6-x-1>=4x+1/2
    x-5/2 +1>x-3
    6x+16>x-4
    -20*(x-35)^2+22500≥4180
    -20(x-35)²+22500≤4480
    4x^2+2x-50>0
    254+2254>X×2
    3+x>0 7-x<0
    sqrt(x1)+x2<=2
    -2a^2+a+3>0
    （1+x)/(1-x)＞1
    -3／x＜-x+2
    0＜xe2+3x+2
    －k－1/5≥1
    －5/k－1≥1
    2x＾2×2x-1>0
    (x+1)÷(1-x)>3x+1

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