(2k+1)＾2-4((k+1)＾2)≥0
    (2k+1)＾2-4(k+1)＾2≥0
    (m-2)^2+4m-20>0
    (m-2)^2+4m-20≥0
    x+1/x-2≥2
    200*0.5+(x-200)*0.6>120
    (a+1)^ (-2)＜ (3-2a)^ (-2)
    x-1≤3/4x-1/8
    2+x-x^2<0
    2/3x+5＞1-x
    45<3x+3（x÷3）＜50
    45<3x+3（x÷3）>50
    a^3＞1/2
    X-3/X+7<0
    X^3-15.3X>81
    3-(x-1)/4≥2+3(x+1)/8
    m2+2>3
    35z+28(5-z)≥912
    2x-x2<0
    4z-25十z≥90

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