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
    2^(x+2)>2^2x+3
    2^x+2>2^2x+3
    sinx≥5/8
    sinx≥5/8
    x²＞2
    3x^2-17X<0
    (x^2+1)/(x−3)>(x^2+1)/(3x−2)
    -x²+4x-4<0
    x²+4x-5＞0
    （x-5）(x+1)(x-3)＜0
    （x²-4x+5）(x-2)＜0
    －1/2x^2+4.75x-0.5>0
    －1/2x^2+4.75x－0.5<0

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