（（xx-2x+3）/（x-2））<1
    （xx-2x+3）/（x-2）<1
    -（a-3）/2a≤-1
    X加6x大于8x
    (√2 )*x>2^(11/2)
    abs(x+2)+abs(x-3)>=3
    3x∧2+32x+37≥0
    abs(3x-5)<3
    53.97975-0.15n-0.2n(n-1)<(n-1)0.4+0.15
    2x-1/3-4x≥1
    -x-1/2x-3>0
    x+1/3x-2≥0
    tanx>8/7
    tanx>7/8
    x^2-50x+30000≤0
    4（k-1）^2-4（k^2-1）＞0
    1-x<=1-ln(x+1)
    tanx>4/6
    tanx>8/6
    x/6

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