4x^2+1872-312x＞0
    4x^2-288x+1728＞0
    2<(3-2t)-(1.5t + 5) ≤ 4
    -3x>5
    9.9*1000y-(7×1000y)-(20-y)×7×1000 >0
    9.9*1000y-(7×1000y)-(20-y)×7×1000 >= 1
    24 * k - k ^ 2 > 42
    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))

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