8x-1≥16x^2
    (4x+1)^2≥0
    3x^2-19x+6≤0
    3x^0-19x+6≤0
    （x/2）-（2x-1/3)<1
    x/2-2x-1/3<1
    x/2-2x-1/3≤1
    x/2-2x-1/31
    16.1*1640x(1362－x/2)
    -2x^2+160x+4000>5850
    -2x^2+160x4000>5850
    900*a+1300*(10-a)≤11800 300*a+500*(10-a)≥4000
    1800*a+1400*(10-a)≤11800 300*a+500*(10-a)≥4000
    450*a+600*(100-a)≥52500
    2x-3<6-x
    log(13，8)
    log(8，5)
    log(5，3)
    sinx+1/sinx≥
    （3（x-1））/4-1≥（x+1）/2-（2x+1）/3

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