（80000－6200x）（80÷（1－x%）－80）＞0
    x+1/2x+1≥2
    80÷（1－x%）×（80000－6200x）×x%≥160000
    4x^2-13<0
    (800-13330.88+x)*0.75/27000≥12%
    (800-12168.93+x)*0.75/2700≥5%
    282+（x-60）*3.5+x+200-200 ＜ 2*{[282+（x/2-60）*3.5]+x/2+120-200}
    x2-2x-15＞0
    2＾k-1≤1000
    5x-x×x-6<0
    100*n^2＜2^n
    8*n^2＜64*n*lgn
    x^2+2x>-2
    (2X+3)/(X-1)<1
    (x+1)(3x-10)≤0
    555555x+777777＜444444x+999999
    (x-1)(x-6)≥(x-2)(x-3)
    8x-4x^2-4＞x^2-5x+6
    ex+e(-x)＞1000/3
    x＞300

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