t^2-8t+15>0
    t^2+4t+3>0
    t^2+4t+3<0
    t^2-4t=3<0
    5x-10<20
    （6x+180）:(5x+30)=18:11
    3t^2-4t+1>0
    3t^-4t<0
    3t^2-3t+1>0
    x^2+x-1/2>0 x^2+x+1/2<0
    x^2+x-1/2>0
    2400×（200000－25000t）×（1－t）≥9000000
    1/(8x)<=1
    1/8x<=1
    （4500×12×0.9-60%×70X×6.95%）÷(40%×70X+5%×70X)=3.8%
    x^2-4>0 2x^2+x-6>0
    x^2-4>0
    2x^2-x-1<=1
    [-2(k+2)]^2-4(k^2-2k-2)≥0
    (x+1)*(2x-1)<=1

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