x^4+x^3-1>0
    5x-2>3(x+1)
    （47.14*x^2+1080.21x）/(147.42x+2160.42)*(24.57x^2+360.07x)-1853.39238-418.894x-1.2*(6.25x^2+217.07x)*(12.5x^2+651.21x)/(37.5x+1302.42)>0
    （47.14*x^2+1080.21x）/(147.42x+2160.42)*(24.57x^2+360.07x)-6224.88438-754.984x-1.2*(6.25x^2+217.07x)*(12.5x^2+651.21x)/(37.5x+1302.42)>0
    <100-2x><50-2x>=4704
    （x+1）÷2<（2x-1）÷5
    5x+1≤3（x+1）
    4x+6<3x+9
    3x-5>2x-3
    （x+1）÷2<2
    1-2x＜3
    254+0.92*(x-400)<=300
    274.01x^4+247.564x^3-16633x^2-193.473x+2109.3318>0
    （1/2）x>(1/3)x
    3-x-2/2>x/3+1
    3-x<-1
    2x-1>4x+13
    2x-5>0
    (x-1)^150*(x-1000)^140>x^150*(x-1001)^140
    C(7,x)×3^x×2^(7-x)>C(7,x+1)×3^(x+1)×2^(6-x)

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