x-2<0
    （x-2）（x+5）<0
    x-5<0
    4x-3<3（1+2x） 3/2x-1>5-1/2x
    0小于2x+1小于1/2
    0小于2x+1小于1/2
    x+1<0
    2x-5<3x
    -（-2）^（x+1）/（x+1）+（-2）^（x+2）/（x+2）≤0.0001
    （-2）^（x+1）/（x+1）-（-2）^（x+2）/（x+2）≤0.0001
    2x-5<3
    2x+1>3 x+1<6
    x²+200x-29900≤0
    x²-2x+256≥0
    0<6x^2+6x+31<10000
    0
    0
    0
    x^2-79x+1061>0
    400a+300(15-a)≤5200 (5/2)a+2(15-a)≥32

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