x+3>0 2（x-1）+3>3x
    x+3>2x-3
    45x+30(6-x)>= 240 400x+300(6-x)<= 2300
    2x^2+2x-1815<0
    0.2≤0.8∧t≦0.6
    x-4＜(x-4)^2
    x-4＜2x
    x-4＜x
    x-4>x
    x-4>0
    2^-(9.7225-(x-26.12)<0.3
    2^-(9.7225-(x-23.52)<0.3
    2^-((x-23.52)-(33.55-26.12))<0.6
    2^-((x-23.52)-(33.55-26.12))<0.3
    2^-(9.7225-x)<0.3
    2^-(9.7225-(x-23.5975)<0.3
    2^(9.7225-(x-23.5975))>10/3
    2^(9.7225-x)>10/3
    2^(9.7225)>10/3
    m+1<=(m-1)^2

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