2^n
    （X＋2）（X+1）^2（X-1）^3（X-2）≤0
    2x/(x-3)>3x/(2x+4)
    3a＾2－10a＋3≥0
    18x+30(20-x)≥492
    15x+20(20-x)≤365
    15x+20(20-x)8≤365
    -2x+2<0
    4x^2+4x-8≥0
    x^2+8x≥0
    x÷（x-1）≥0
    2x^2-5x-3≥0
    0.915164x^3 -260.764x^2+24614.8x-768549>0
    x^2-8x-20＜0
    x^2-4x＜0
    x^2-x＜0
    x^2-3x+7＜0
    x^2+4x＜0
    （x-2）^2（x^2-3x+2）≥0
    3-a<4-2a

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