a＜10-a, 25a+30(10-a)≤285
    (3x+1)*1/2>1
    2（x-1）-x<=2
    2+1/x>0
    m+1>2√2
    9+4*(x-1)>0.8*(96+4.6*(x-20))
    7.5+2*(x-1)>0.8*(75+3.4*(x-20))
    7.5+2*(x-1)>0.8*(75+3.4*(x-20))
    7.5+2*(x-1)>0.8*(75+3.4*(x-20))
    4*(x-2)>2*(3*x+5)
    3+5m/2<0
    1000-10n > (1.65*sqrt(n))^2
    2a<0
    1-3x>0
    x>294×e^(-295×5)÷(1-e^(-294×8))
    e^(-1.52)×1.52^x÷!(x) >0.995
    e^(-1.52)×1.52^x÷!(x)>0.99
    100x>20
    12x>5
    （162.86ln（16x））/x≤5

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