3-x(x-2)＞0
    (3n-2)(2n+4)(n-6)≤0
    (2x-1)(x-3)≤0
    2x－2/x＋3＜1
    4-x^2<=0
    4-x^2>=0
    2（9-2X1）=3（11-2X2）
    -1/3x+1≤2/3x
    -2x＞0.5
    0.75x＞-0.25x-1/3
    0.75x＞-0.25x
    x^（7x-3）>=1
    x＞1
    x-1＜0 2-3*x＜0
    x-1＞0 2-3*x＞0
    x-1＞0
    (149.66/x)+(14.62/x^2)+(268.43/x^3)+(377.66/x^4)+(388.29/x^5) = 360.98
    x^2-700x+117600≦0
    W×18%＋（1－W）×13%＝16%
    17-5x<-10x+2

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