((a/430)^2-1)*(430-a)*2*0.01>0.02
    ((a/430)^2-1)*(430-a)*4.07*0.001>4.07*0.001
    (500x+300)×1.616＞[500(x+0.466)+300]×1.15
    (600x+300)×1.616＞[600(x+0.466)+300]×1.15
    (600x+400)×2.616＞[600(x+0.466)+400]×2.15
    (800x+300)×2.616＞[800(x+0.466)+300]×2.15
    (600x+300)×2.616＞[600(x+0.466)+300]×2.15
    xcosx＞0
    287989*1.137^x>12500000*1.03^(x-1)
    -4082750+3000000+W-W×10%/4-450000≥300000
    26700+x-x*10%/4≥50000
    32x+24(50-x)≤1392
    m^2-5m-32>0
    60x^2+60x-727>=0
    -1+3/2a<-2
     2 * a / 2 * a - 3 / 2 * a > 2
    2a/2a-3/2a<-2
    -（2a-3）/2a<-2
    -x^2-3x+4>0
    -1+2a/3<-2

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