ex>1
    (2*260980+2-260980/x/2)*(260980/x-1)<2147483648
    3-[（1+n）/2∧（n-1）-1/2∧（n-2）]＜168
    2^x>=51
    (2*359718+2-359718/x/2)*(359718/x-1)<2147483648
    2.4+0.4x<4.5
    359719-2*x+2+((359718-3*x+2)^2)*0.5-(x^2)*0.5<2147483648
    359719-2*x+2+((359718-3*x+2)^2)*0.5-(x^2)*0.5<21474836480
    129398478400+8x^2-20*1079160x<21474836480
    129398478400+8x^2-3*1079160x<21474836480
    129398478400+8x^2-2*1079160x<21474836480
    129398478400+8x^2-1079160x<21474836480
    129398478400+8x^2-1079160x<2147483648
    3x>5
    -5000+x-0.25x≥10000
    -500+x-0.25x≥10000
    (x-50)(-20x+2600)≥24000
    x/x-2＞0
    (y-20)*0.8+20>80
    80%x*0.8>80

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