ln x>0
    -2x+1<7
    3X+4>5
    3x+4>5
    X∧2-2X-4＜0
    5x+1
    5x+20<0
    x+1/6-3x<0
    (10400-150x)/100/X+8<25
    (10400-150x)/100/X+3<30
    0<(10400-150x)/100/X+3<30
    0<(10400-150x)/100X+3<30
    (10400-150x)/100X+3<30
    2<2a-√（4a*a-4)<4
    0<2a-√（4a*a-4)<2
    0<2a-√4a*a-4<2
    0<2a<2
    -(x+1÷2)＜3
    2≤|3x-2<|5
    2≤3x-2<5

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