(2.5-1.25K-0.125K^2)/(2.5-0.25K)>0
    x-55-100*1%-x*1%≥20
    x-55-100×1%-x×1%≥20
    (1.95x+360)*2.38*0.65>(1.7x+360)*2.53*0.85
    (1.95x+360)*2.38*0.9>(1.7x+360)*2.53*1.05
    (1.95x+360)*2.38>(1.7x+360)*2.53
    0
    0
    (3a^2+3)(3a^2-5)<0
    16-4(3a^2-2)>0
    a^2>=5/3
    30A+1600-20A小于等于2000
    a^2-6a-3>=0 -1
    a^2-6a-3>=0/0
    a^2-6a-3>=0*e
    a^2-6a-3>=0
    0.8*350*a+0.85*400*(50-a)<=14900
    (0.625-x)>（((x*(1-x))/48)^0.5）*1.35
    0.6x+1.1(80-x) <69 0.9x + 0.4(80-x) < 52
    p^2-3p-1.25>0

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