(x-4)(x+1)<0
    x-4<0
    x＾2-4x+2<0
    x^2+(1-x)^2 > x
    x^3+(1-x)^3 > x
    1-x^3-(1-x)^3>x
    x^3+(1-x)^3>x
    (1-x)^3+3*x^2*(1-x)
    1-x*(x^2+3*(1-x)^2)>x
    x^2+3*(1-x)^2>1
    2/3a－1＜0
    2/3a－1＜0
    3a－1/2＜0
    -sinx≥0
    6x^2+7x-1≤0
    （x＾2-2）（x+5）<12x＾2-16x-2
    1.3X-591>256
    1.3X-278>128
    1.3X-129>64
    1.3X-59>32

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