Mathematics
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    t²-t-81≤0
    -2X +3 ≥ X
    1/4y≤-2
    3x>1
    4x+3<3x
    12x-6>0
    20x+3000小于30x
    0.7580≤0.4630cosx-0.2333√(1-cosx×cosx)
    0.7580≤0.4630cosx-0.2333sinx cosx×cosx+sinx×sinx=1
    0.45
    
23<56x+3<255
    10x<2
    (x-3)(x+1)<0
    lnx<0
    —120x+12000<8500
    2cosX+1>0
    -1≤1/x≤1
    4➕12a≤0
    (8/10)^n<1/10
    1/2(x+4)≤2

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