2/3-11/3a小于等于1
    15大于3-2a
    14小于等于3-2a
    85大于等于5y-3(20-y)
    75小于等于5y-3(20-y)
    75小于等于5y-3(20-y)
    20-10k-k²/(10-k)>0
    4<=abs(-9/4m+9)<6
    4<=abs(-4/9m+9)<6
    e^x-3/2x²＞1/e－3/2
    e^x-3x²/2＞1/e－3/2
    m^2-8*m+15>0
    ( ( 62 ^ ( 1 / 2 ) ) * ( 66 ^ ( 1 / 2 ) ) * ( 462 ^ ( 1 / 2 ) ) ) / (40 * K) >1000000
    ((62^(1/2))*(66^(1/2))*(462^(1/2)))/40K>1000000
    40x+(150-120)(50-x)≥1850
    40x+(150-120)x≥1850
    1600+560x大于640x+1280
    30小于等于47-b 47-b小于等于40
    (1+a%)(1+2a%)大于等于((5+a)%+1)
    (1+a%)(1+2a%)大于等于((5+a)%+1)*100

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