4/7
    x*x-53/7*x+4<0
    5×（17.79−x）+8×17.79＜15.5×13
    -m-1≤1
    -3≤-m-1≤1
    84Q＞0
    sin34<0.77
    5x^2-6x+5＞0
    (450Q*0.13-15Q-30.4)＞0
    (450Q*0.13-15Q-30.4)*0.12＞0
    （450Q*0.13-15Q-30.4)＞0
    （450Q*0.13-15Q-30.4)*0.12＞0
    x²-7x+6＞0
    0≤x-1/x+1≤1
    -x²+2x+3<3
    x－5/（x＋3）^2＞0
    （x＋7）／（8-2x）＞0
    x＋7/8－2x＞0
    -1/a<=1-sqrt(1+3/a)
    4-4×2m≥0

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