Mathematics
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    (x-300)*0.8+300>(x-200)*0.85+200
    !(35)/!(r)*!(35-r)>=-1/2
    C(35,x)>=-1/2
     n^n/(n+2020)^n-2020 n大于2020
    n^n/(n+2020)^n-2020 n大于2020
    (x-1)/2-(2x-1)/3<1/3
    x-5<(x-12)/3
    (x-2)(x-4)>1
     (x-2)(x-4)>1
    2a^2+12a-7 < 0
    10x^2-19x-15≥0
    cosx+x-1>0
    1-x>-1
    15+0.3X>25+0.2X
    3x-2≤x+6
    (5x-3)/3+1>x
    2x-2≤x+6
    c-2>0
    c+6≥3c+4
    2*-3-m≤0

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