2(x-0.25)^2＞3.125
    -1/2
    -1/2<4/a
    -1/2
    [sqrt(x+1)*(2x-1)*(2x-1)*(3x-5)]/(x+2)>x+5
    [(x+1)*(2x-1)*(2x-1)*(3x-5)]/(x+2)>0
    4*2+3*4+2*（x-2-4）≥2*18
    -15000+X-X*8%/4≥4500
    2x-3<9-x
    175（30-z）+80z≤2600
    3x²-7x-6<0
    168-X-X*10%/4*3≥30
    x+1>2＾x
    168-X-X*10%/4*3≥30
    m＜3 m≤3
    m＜3 m≤3
    1-0.2^x≥0.99
    xln(1-x)+x∧2<0
    xln(1-x)+x∧2>0
    xln(1-x)+x∧2>0

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