20+0.25x<=25
    (0.9x－100)/√(0.09x)＞1.6499
    (0.09x－100)/√(0.09x)＞1.6499
    (0.09x－100)/√(0.09x)＞＝1.6499
    (0.9x-100)/√(0.09x)＞=1.6
    2x
    23.35+0.25x<=25
    13.11-0.3x>0.21
    13.11-0.3x>=0.21
    2x
    20.11-0.28x>=0.27
    13.11-0.3x<=20
    14+0.2x<=25
    3x+4<2
    20.11-0.28x<=20
    78k^2－60k＋17≥0
    78k2－60k＋17≥0
    （16-10）×200×（1-20%）+200×（x－30）≥3200×90%
    (-1-m)^2-1≤(4-m)^2-1
    22+0.25x<=25

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