-2x2+x小于等于0
    2－x╱x-3≥0
    2－x╱x-3≤0
    0.25*(sin(x/2)^2)+9/64*(sin(x/2)^4)<0.005
    -m-√（m²+8）≥4
    -m-√（m²+8）＞-3/4
    710v/(v^2+3v+900)>10
    2sqrt2(k-sqrt2)/3<0
    k-(8sqrt10)/3>0
    k-8sqrt10/3>0
    10×（1-0.8^n）/0.2＞49
    2sqrt2(k-sqrt2)/-3>0
    8(k-sqrt2)^2-12(k-8sqrt10)>0
    k-sqrt2>0
    16(1-k)^2-12(k^2+4k-5)<0
    -0.5<=-x/2<1
    25x-(3000+20x-0.1x^2)>0
    0.1x^2+5x-300>0
    （2x+1)/(x-1)<1
    -2x^2+45x-100＞0

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