1+lgx＜0
    2x^2+x+8≥0
    (x-2)/(x^2-6x-7)＞0
    2x/(3-x)≥1
    1
    （3x-1)/(2-x)≥1
    -2<=-m/2<1
    (2x+1)/(x-1)<1
    x²+2＞x+√2
    x²+2＞1
    x²+2＜1
    7-2x<=3x-1
    x+5<=3x+7
    (x-1)(x+3)>0
    (x-1)/2 <= x/3
    2x+5<3(x+1)
    0.5^√2x-1>0.5^x-2
    abs(3x-2)>0
    2x-5sinx>0
    x^2-3x<＝4

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