cos(x)>=0
    (264*7+88x)/(264*88)<0.21
    (264*7+88x)/(264*88)<0.2
    （20/（0.5A-0.02））+(35/(0.5A-0.1))≤(30/0.06)
    abs(3x-4)<1+2x
    （30/（0.5A-0.06））+(20/(0.5A-0.02))≤(35/0.1)
    (1+x)÷x≤1+2x+1
    x>0
    x^2+2x+3>-1
    x^2<=4
    （x-1）^2＞1
    8x+4＞45
    m≥1/3(20－m)
    2x+3>(3+x)/2
    2x-6<6-2x
    3x-2>4x-5
    12-2x>3x+2
    4/5x+2>-6/5x-3
    4x+10>-6x-15
    （16/（0.5A-0.06））+(20/(0.5A-0.02))≤(35/0.1)

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