x^2-2*x-3>0
    x^2-6*x-27<0
    x^2-4*x+1<0
    [(1-2*x)]/(x+1)>0
    1.25^x+0.8^x+0.8^x>=3
    (x十3)/7>x一5
    x十3/7＞x一5
    x/5十1
    0.16x^2－0.64x－143＞0
    8-x^2＞-2x
    5x^2-8x+3<0
    e^(1-2x)＞(1/2x)
    20-16k^2＞0 (-5)/(1-k^2)＞0 (-2k)/(1-k^2）＜0
    (a-1)^3-2(a-1)+e^(a-1)-1/e^(a-1)+(2a^2)^3-2(2a^2)+e^(2a^2)-1/e^(2a^2)≤0
    e^(4a^2+a-1)+(8a^6+a^3-7a^2+a+1)e^(2a^2+a-1)+e^(2a^2+a-2)-e^(2a^2)-e^(a-1)≤0
    （x*x）+1>3x+5
    （x*x）-3x-4>0
    3+2a-a^2≤0
    3-2a-a^2≤0
    abs(x-3)＜2

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