70-a≤3a, 25a+15*(70-a)≤1245
    b+3>0
    (b-3)^2-4*9*1>0
    120a+4500-90a≤5500
    a＞100-a, a≤300-3a, 10a+1600-16a≤1170
    1/(x+6)<2/(x-4)
    1/(x+6)<2/(x-4)
    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

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