2（3x－4）≥4-3x
    2x－2≥1-x/2
    2^7＞x
    3-x/x-1>2x-1/3-2x
    3-x/x-1<2x-1/3-2x
    -3x²+5x+6<0
    -3x2+5x+6<0
    2^x+7^x+x^2+x≥-125
    e^z-z^2-z>1
    e^z-z^2-z≤1
    e^z-z^2-z<1
    e^z-z^2-z≥1
    cosx>x^2
    sin(0.1πt)≤-0.2
    x²+4x＜0
    （x+2)(3-x)<1
    x-263-200＜0.55(x-88-200)
    x-263＜0.55(x-88)
    x-263＜0.45(x-88)
    2^(x+2)>2^(2x)+3

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