18n大于51n
    (1-6b)^2-4×3×8>0
    -2＜m-1
    -5
    (10^6+10^6*121/24*x)*[(1+x/12)^120-1]-10^7*(1+x/12)^120*x>0
    (1+x)^16-(1+3x)^6+2x>0
    2x + 5 ≤ 11 - 3x
    x^2-1>-1
    x-1>-1
    20y+14*(1200-y)≤20000
    20y+14*(1200-y)≤2000
    20y+18*(1200-y)≤2000
    (x*x-5*x+5)*(x*x-5*x+5)-1<0
    (x*x-5*x+5)*(x*x-5*x+5)-1<=0
    3*x*x+9*x+8>=0
    20000*(300/(300+0.775x))>20000*(300/(300+x))*1.4
    300/(300+0.775x)>(300/(300+x))*1.4
    300/(300+0.775x)>300/(300+x)*1.4
    cosx>2
    -2＜-3/k-3≤-1

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