（0.75）^x <10^(-4)×0.25÷5
    3x^4-8x^2-16 > 0
    （0.75）^x<10^(-4)×0.25÷7.7
    a²+a-1＞1
    a^2+a-2＞0
    x∧2+6x-7≤0
    0.95x>=17.43
    N * 0.95 >= 17.43;N <= 18.05
    N * 0.95 >= 17.43；N >= 18.05
    X^2-4/3x+5＞0
    （x-1)(x+2)>0
    x+2/4<1-2x/7
    x/3-1>2x/9
    x/3 -1 > 2x/9
    a^2+a+1≥0
    2x∧2+7x+3＞0
    9k^2+8k+4＞0
    (x+3/x-20)>2
    x+3/x-2>2
    2x^2-3x+1>0

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