tan90>0
    x^50*(1-0.4x)<0.6
    x^100*(1-0.4x)<0.6
    x^5*(1-0.4x)<0.6
    35>23+2x
    (10000.5-0.8n)/(0.4(n^0.5))≤-2.75
    (10000.5-0.8n)/(0.4(√n))≤-2.75
    (10000.5-0.8n)/(0.4√n)≤-2.75
    (10000.5-0.8n)/(0.4n^0.5)≤-2.75
    (0.9n-10000)/(0.3n^0.5)≥2.75
    (99.5-0.99n)/(0.0995n^0.5)≤-1.645
    (-99.5+0.99n)/(0.0995n^0.5)≥1.645
    (99.5-0.99n)/(0.0995n^0.5)≥1.645
    (99.5-0.99n)/(0.0995*n^0.5)≥1.645
    (99.5-0.99n)/0.0995*n^0.5≥1.645
    x*6.9544<(x-15)*6.9918
    （X-5）（X+1）（X-1）（X+2）≤0
    2k-3＞-2k
    2k-3＞2k
    （2k-3）²＞4k²

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