x²-4x-5>0
    x-1/x-2>=1
    38<9x
    -3x^2+60x+80≥330
    352-17.7x≥330
    3x²-68x+115<0
    3^(1-x)≤3
    3^(x-1)≤3
    950+0.3x ≤ 2x
    (380+x*0.3/2.5)*2.5 ≥ 0.5x
    (380+x*0.3/2.5)*2.5 ≥ 2x
    950+（x*0.3/2.5）*2.5 ≥ 2x
    950+0.12x≤2x
    950+0.12x≥2x
    （x-3）/（x+1）＜0
    3≤x^2-2x+4＜4
    32 − 7 + 2 < 0
    (1+10x)(1+2x)(1+0.2x)+20>0
    2x∧2－4x＞0
    -x²+x＞0

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