66*x^13-143*x^12+78*x^11>0.5
    (1+x^2)/(1+x^4)<=
    (2k-3)^2-4[k(4k-2)]>0
    （m-3）^2-4m>=0
    （300-20sqrt(3)t)^2+(20t)^2<=（250+10t)^2
    （300-20sqrt(3)t)^2+(20t)^2<=250^2
    （300-20sqrt(3))^2+(20t)^2<=250^2
    m<√(1-m^2)<2m
    x^2-2x+1>0
    -2*K^2-8>=17K
    50x-19.6x^2＞19.6+1.94
    132216.85*（1.03）^x＜26971.64*（1.1）^x
    (300-20sqrt(3)t)^2+400t^2<=(250+10t)^2
    2-x≤1
    2-x＜＝1
    2x-1＜3
    2-4x＜3(3x-1)
    3x-5＞10
    2x-4＞0
    （x^3）/1000-100x^2+10>0

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