Mathematics
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    3x+2>x 3/x+2≤x-1
    2660×X>20000+544.6875
    15a+20(30-a)≤502 15a+20(30-a)≥479
    15a+20(30-a)≥479 15a+20(30-a)≤502
    (6000+7500x)×32/(3.1415×x^3)≥35
    0小于2x+1小于1/2
    x+5<0
    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

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