ln(4-x)>-ln2
    2*e*x＞e^x
    2*x*e-e^x＞0
    2*x*e-ex＞0
    3a^2+52—26a>0
    abs(3-2x)<9
    x>-3.8
    x>8/3,
    cos(π*(t-8)/2)<=-0.5
    5^x＞5000
    （0.719297+0.25x）×（3.456×3.45688-0.719297-0.25x）>3.456×3.456×（0.041574+0.10875x）
    (x-2)^(4/3)>0
    (N+1)^(1/3)-(N)^(1/3)<0.000006
    （5x-1）/3＜x+1
    441*x^3+413*x^2+6028*x+8724＜0
    一2X2＋x≥一3
    x2≤4
    （0.719297+0.25x）×（3.456×3.45688-0.719297-0.25x）>3.456×3.456×（0.41574+0.10875x）
    3x^2-32x+64＞0
    tan(x+π/4)≥1

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