4k(4k-5)<0
    x-3x＜2x+5
    6－X^2＞X
    log(x,0.5)<1
    3b^2-4≤0
    b^2≤4/3
    114.67/(2×h×0.57735026918962576450914878050196+1.4)+15×h≤200
    114.67/(2×h×tan30+1.4)+15×h≤200
    17.325*h^2-210h-165.33≤0
    1.7325*h^2-228.9*h-165.33≤0
    114.67/(2×h×tan30+1.4 )+15×h≤200
    3^x>5x
    abs(x-3)+abs(x+4)≥9
    x^2－4≥0 4－x^2≥0
    x^2－2x≥0
    (1-0.3) ^x<0.2
    t^2+2t+1≥11/6
    1-x>4 3X-4<3
    1-x>4
    （1+x）^3<0

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