36+24k>0
    (-k)^2-4k>0
    (-k)^2-36>0
    4-4k>0
    7500/(a+74.88)+10000/(a+62.4)+30000/(a+10.4)小于143
    7500/(a+74.88)+10000/(a+62.4)+30000/(a+10.4)＞143
    10+（3n+7)(n+1)<=2048
    a<=3
    100a+120(300-a)≥32940
    lgx＜1/2
    150÷(225+x)≥10%
    15m+25(48-m)≤1000 m＜48-m
    x/280+6000＜（x+1000000）/240
    4/(x+2)+1>x-1
    (x^2)/3*(110.65+19.41x)*(331.95+38.82x)/(221.3+38.82x)≥2*(x^2)/5*(75.44+6.404x)*(226.32+12.81x)/(150.88+12.81x)+684.421+203.71x
    (x^2)/3*(110.65+19.41x)*(331.95+38.82x)/(221.3+38.82x)≥2*(x^2)/5*(75.44+24.904x)*(226.32+49.81x)/(150.88+49.81x)+684.421+203.71x
    x＞1
    (x-5)(x-2)>0
    -0.75x+1.5≥-6÷x
    tanx-tan（x-1）＞1

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