Q*(150-90)*0.8+(8000*(150-90)+(Q-8000)*(20-90))*0.1+(10000*(150-90)+(Q-10000)*(20-90))*0.1 >558000
    Q*(150-90)*0.8+ (8000*(150-90)+(Q-8000)*(20-90))*0.1 + (10000*(150-90)+(Q-10000)*(20-90))*0.1 > 558000
    Q*(150-90)*0.9 + (8000*(150-90)+(Q-8000)*(20-90))*0.1 <= 558000
    2^x+2^（-x）>=4
    0<(-x^2+2x+3)/(sqrt(x^2+1)*sqrt(5x^2+12x+9))<1
    x<3x+4
    x^2+3x>100
    (2t^2+15t+7)^2>-(16t^2+28t+49)(t^2+2t+4)
    (2t^2+15t+7)^2>(16t^2+28t+49)(t^2+2t+4)
    (50/29)y>(25/7)y-(15000/7)
    x+3>6 2x-1<10
    2/3x+5>1-x x-1<=3/4x-1/8
    x-5>1+2x 3x+2<=4x
    2x>1-x x+2< 4x-1
    2（x+1）>1
    （x-1）/7<（2x+5）/3
    （x-1）/6> （2x-5）/4+1
    2（x+5）<3（x-5）
    5x+15>4x-1
    abs(1.5*x) < 0.5 abs(0.5 - 1.5 * x) < 0.5

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