x^5-4x^4+4x^3-x<0
    x^5-4x^4+4x^3-x>0
    ln(x+1)
    5-x+2cos(x^2+x^(1/2))>0
    (x-1)^2(x^2-4x+1)>0
    (x-1)^2(x^2-4x+1)<0
    1-2x≥（x-3）/2
    3（x-1）>x
    x－3x－2≥4
    -3＜2x＋2-6x
    x1^2+x2^2＞=328846.56/（x1x2）
    550*x+495*(7-x)<=7370
    2000-20x≤400/x+30
    20x≤400/x+30
    3/x+（x-1）∧-1≤1
    x-3≤4x+3
    3.14*1*120*x+3.14*0.5*0.5*2830≥2*2486.26
    16*a^2-32*a<0
    (800+x-12018.93)×(1-25%)+5063.15≥5634.18
    (800+X-12018.93)*(1-25%)+5063.15≥5634.18

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