18<14*(14+12x)/2.4/7.5<19
    17<13*(14+12x)/2.4/7.5<18
    13<10*(14+12x)/2.4/7.5<14
    9<7*(14+12x)/2.4/7.5<10
    11<9*(14+12x)/2.4/7.5<12
    10<8*(14+12x)/2.4/7.5<11
    {x-3<5-x {x+2>=-1
    6/n－n+1≥n－2
     −k2 +2k≥0
    (1-x)/(x+3)≥0
    x^2-220x+19700＜0
    x+3>6-2x
    30-x≥0
    (x-1)^2/(x+1)^2<0.005
    20x+15（16000-x）≤【50x+60（16000-x）】*30%
     5x+1000-10x<760
    abs(x+1)-abs(x-2)<-1
    1-√2m+24/49m^2＞0
    2-2m+24/49m^2＞0
    48-4x+8>2x

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