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
    x+2/（x²-5x-6）＞=0
    x+2/x²-5x-6＞=0
    x+2/x²-5x-6＞=0
    3x²-7x≤10
    (3-x)/(2x+1)≥1
    4y>16
    15t^－24≤0
    5t^－8≤0
    x^-x-6＞0
    cosx＞x²+x+1

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