0.5x^3-5.5x^2+14x>90
    150000+25000X≥150000×1.125^X
    150000+25000X = 150000×1.125^X
    -3x^2+24x≥45
    -0.5x+4.5-8/x>0
    6x−8x=20
    6x+240−8x=220
    a^2-（4/a）≥0
    4（-x/2）+2x+1=1
    x^2-4x+3＜0
    2x^2-x-3＞0
    3x-1-2（x-5）≤0
    3x-1：x-5≤2
    3x-1/x-5≤2
    x^2-2x-3＞0
    x2-2x-3＞0
    3+x＜4+2x 5x-3≤4x-1 7+2x＞6+3x
    3+2x≤4+3x 7x-4＜6x-2 7+3x＞4+4x
    a^2+3a>0
    2(x+2)-6≤-3(x-4)

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