x-1+9≤-3x+6
    x-1+6≤-3x+6
    (x-1)/3+3≤-x+2
    （x-1）/3+3≤-x+2
    x-3（x-1）≥5
    x-（x-1）≥5
    0.5M+1.2（36-0.5M）≤40
    4y+1.5(10-y)>33
    2(x－5)(x+3)＞2x+1
    200x+100（34-x）＞4000
    x－1/x－5＜0
    （x^2-x^3+2x）（x^2-1）（-x+4x-8）≤0
    (-a-1)^2-4a(3-2a)>0
    lnt＞1/t
    4K(4K-5) ＞ 0
    x^2－5x＋6＜0
    X^2-X-6≤0
    12x≤10
    (x1-3)(x2-3)＜0
    （1/140x+1/210x）<1

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