6xxxxx-25xxxx+72xx-16x-49>0
    （a-3/2）＾2>5/4
    a＾2-3a>-2
    a＾2-3a+2>0
    2a-2
    2a-2
    2a-2
    4*x*x-5*x-1>0
    30x-5x^2-25＜0
    30x-35x^2-25＜0
    14x-3x^2-15＜0
    (8/3×tan(x+π/2))^2-4×((tan(x+π/2))^2+1)×(-17/36)＜0
    13
    x>2
    14-4x*x大于等于x
    x小于0，x+1除以4x-2
    14/5≤t≤28/5 t≤74/25 t≥34/25
    (64/5-3t)/2≤3+t
    (64/5-3t)/2≥-1+t
    ((5-t)+(-9+4t))/2≤3+t

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