90a+60(600-a)≤43200 2a≥600-a
    90a+60(60-a)≤43200 2a≥600-a
    3∧（x+1）-2x＜1173
    -2-3X＞1
    3/4x-1≥1
    x^2>4
    (8-k)²<(15-k)²
    8-k>15-k
    8-k<15-k
    -50-（100+X）*1%+X≥10
     -1082750+X-X*10%/4-450000大于等于300000
     -1082750+X-X*10%/4-450000大于等于300000
    -1082750+X-X*10%/4-450000大于等于300000
    7000+7000×75%（x-1）<7000×80%x
    7000+7000×0.75x<7000×80%x
    x^20<1.001^x x>200
    x^20<1.001^x
    sqrt(x^2-6x+5)≥x-2
    0＜5x+15-7（x-1）＜3
    3x+1/x-1<2

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