-900x+50000<=39200
    5x+2>3(x-1) (1/2)x-1<7-(3/2)x
    (2x-1)/3>(3x-5)/4 (x+2)/4-x/5>1
    2x+6>7x-4 (4x+2)/5>(x-1)/2
    -3(x-2)>4-x (1+2x)/3>x-1
    x^2+x<0
    25x-4.6x>73.6+20
    20.4x>93.6
    160≤400/(a-20)≤240
    1/x<0.001966
    80*x+100*(300-x)≤26800
    exp(x)>0.99803640784
    3000x+(40-x)3200≥123200
    2500x+(40-x)2800≤105700
    2500x+(40-x)2800≤10570
    （10-C）/10 ＞0.55
    （S-5.3）/S ＞0.55
    2x-√5x＞3
    （S-7）/S ＞0.55
    （S-5）/S ＞0.55

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