2x+3>7
    x-2<7
    -2x-3>5
    1-y<=(y+3)/2-1
    2sin(x+30）>0
    x^2-6x+9≥0
    x^2+6x-9≥0
    x^2-x+¼＞0
    sin(7x)*sin(x)>1/4
    3-x/(2x+1)≥1
    X2-25X-300≥0
    (2x-1)/3-(9x+2)/6≤1
    0.005x²+0.05x-10＞0
    0.01x²+0.1x-12＜0
    26 700+x-x×10%/4≥50 000
    x(160−2x)−x(500+30x)≥1300
    308*a/(a+88)>220
    308*a/(a+88)>220
    5k²-18k+5≤0
    a（a-1）＜0

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