x-(x+3)/2<1
    （X^2+5X-6）/（X-1）≥0
    X^2+5X-6≥0
    xe^2x-lnx-1>0
    x-1/2*(x-1/2*(x-1))<2/3*(x-1)
    4-4（k+2）≥0
    4－2/x≥0
    （800÷2）-X＞(800-X)÷2
    x-3＜2*x＋5
    x-3＜2x＋5＜7
    x-sinx<0.0005
    ln(1/1-c)+(c-1/1-c)+1<0
    -450+x-690-x*0.08/4 ≥500
    -450+x-690-x*0.08/4≥500
    a^2+a<2
    8-2m＜0
    x^2－8x＋15＞0
    4*m^2-5*m+1>0
    x^2+4x-21>=0
    6x-2>2(x-4) 2/3-(3-x)/2<=-x/3

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