9－t＞√（12t）
    -3x^2+8x-4≤0
    k*2-3k＜0
    （3x-1）/（2-x）>=1
    5a-10+8＜6a-6+7
    (20-3/8x)x+(100-x)(1+2.5x%)*10>1400
    (20-3/8x)x+(100-x)(1+2.5x%)>1400
    (m-3)^2-4*0.5+-m+2>0
    2x²+3x-5＜0
    a*a>1
    2x²+5x-5＜0
    x^x>8
    5x>8
    4m^2+4m-23<0
    -7y^2-2y+1>=0
    (-2x-4)^(1/2)
    (-x-1)^(1/2)
    2^x>x^2
    a^2-4a+4＞0
    （4-x）除以（2x+3）≥1

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