(449.093-x)*(1085.6-667.79)-(x-429.06)*(1146.4-1085.6)>=0.02165*(1085.6-667.79)*(1146.4-1085.6)
    (449.093-x)*(1085.6-862)-(x-431.632)*(1146.4-1085.6)>=0.02165*(1146.4-1085.6)*(1085.6-862)
    (449.093-x)*(1075.6-862)-(x-427)*(1146.4-1085.6)>=0.02165*(1146.4-1085.6)*(1075.6-862)
    1+x+x^2<1
    0.5*4.5x+0.4*(15-4.5x)/3<=5.2
    （x-2）（1-3x）＞2
    -10x²+210x-800≥280
    x＋2/x-5≤0
    2x-3/x-5≤0
    ln（2x+6）≥0
    ln（2x+6）＞0
    2x+6＞0
    2^x+x＞1
    2(x^2+5/2x)-3<0
    2(x^2+2/5x)-3<0
    2x^2+5x-3<0
    -1＜1-a＜1
    -1＜2a-1＜1
    -1＜2a-1＜1-a＜1
    （5000-50x）>10x^1/2

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