x≤50 y≤220-50
    1/(2.4(1-x)+x(2-x)-0.3)^0.5≤1.1/0.6(2.4+x-0.3)
    1/2^(k+1)<0.05
    (2x^3+X-1)/x＞0
    -1<=(2x-1)/7<=1
    x^2-x-6>0
    4-x^2>=0
    x^2+15x-1>0
    m/（1-m）>e
    x+1>3 x-1<2
    x*x>16
    12x-7>16>7x
    12x-7>16>7x+9
    n^3＞2(n-1)^3+3
    x^<=0
    -x<=0
    x^2<=0
    x^2>0
    x^2>=0
    －πx/(√1－x∧2)≦－1.714798

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