-16300+x-x*0.1/4≥3000
    -6300+x-x*0.1/4≥3000
    -6300+x-x*10%/4≥3000
    -50x^2+525x-1900≧0
    (3-2a)*(3-2a)-8*(8-3a)>0
    2^(-x)<0.3
    2^-(x)<0.3
    2x+1>5 x+1>4(x-2)
    x+1>4(x-2)
    x-2/x>-2x+1
    9*x^2-8*x+30>0
    4x-1>3x+1 x+4<4x-5
    x-6>-2x
    x+3>0 2（x-1）+3>3x
    x+3>2x-3
    45x+30(6-x)>= 240 400x+300(6-x)<= 2300
    2x^2+2x-1815<0
    0.2≤0.8∧t≦0.6
    x-4＜(x-4)^2
    x-4＜2x

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