16x^2-129x+256＞0
     -3 >34 / 21 * x
    -3>34/21x
    2-(4/3)x>(2/7)x+5
    2-4/3x>2/7x+5
    -3/2x+5<-2/3x+1
    -2/5x+2<3
    1/3x+4>3
    6*x ^ 2+8 * x+9>0
    15+x>6
    0<（1+x）（1-x/1.5）<1
    1-3m＜0 m-4＜0
    1-3m＜0
     -10x^2-512x-128>=0
    -10x^2-512x-128>=0
    225x^2-675x+146.25<0
    75x^2-22500x-750000-195x+15000>0
    (1+0.005x)*(500-x)*1.5>750
    1.5(1+0.005x)(500-x)>=750
    (25+y)(8-0.2y)≥200

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