24 * k - k ^ 2 > 0
    24 * a - a ^ 2 > 42
    0≤-10x∧2+700x-10000
    （2x+1）/3-（5x+1）/2<1
    36x^2+24x-12 <0
    36x^2+24x-12<0
    36X+24x-12<0
    4
    7^2<54
    (m-4)^2-4(6-m)>=0
    1.691*(1.15+x)≤1.816*x
    1.691*(1.15+x)≤1.816x
    1.691*(1.15+(2.78*x）/(x+1400))≤1.816*(2.78*x/(1400+x))
    1.691*(1.15+2.78*x/(x+1400))≤1.816*(2.78*x/(1400+x))
    70a+50(30-a)≤1600
    x^2-2x＞0
    -10x^2+110x+2100≥2200
    −(4a^3−a^2−14a−25)＞0
    −(4a^3−a^2−14^a−25)＞0
    −(4a3−a2−14a−25)＞0

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