a-1<2a^2+4a
    3x^2+x+1>0
    x^2+2x-2<0
    x^1/3
    2－x≥-1
    14+（n-1）2＞1.2/0.83n
    14+（n-1）2＞1.2n
    8+5n-5＞1.8n/0.83
    8+5n-5＞2.5n/0.83
    8+9n-9＞6n/0.83
    8+6n-6 ＞3n/0.83
    18+9n-9＞3n/0.83
     18+6n-6 <2.5n/0.83
    18+6n-6＜2n/0.83
    （3x+6）×4＞0
    4x+7＞＝6
    7x-1＜＝4
    4x^2-15x+9>0
    3000+2250a≥4800
    3x+2＜6

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