10Y/1000*25>100*1.5
    3000*Y/1000*25>100*1.5
    x2-997x-1502＞0
    1000y/1000*25>100*1.5
    500*Y/1000*25>100*1.5
    70Y/1000*25>1.5
    (100Y+30Y+15Y+12Y+10Y+8Y+7Y)/1000*10>100*0.1
    (100Y+30Y+15Y+12Y+10Y+8Y+7Y+6Y+5.5Y+5Y+4.5Y+4Y+3.5Y+3Y)/1000*10>100*0.1
    (100Y+30Y+15Y+12Y+10Y+8Y+7Y+6Y+5.5Y+5Y+4.5Y+4Y+3.5Y+3Y)/1000*25>100*1.5
    (100Y+30Y+15Y+12Y+10Y+8Y+7Y)/1000*25>100*1.5
    (100Y+30Y+15Y+12Y+10Y+8Y+7Y)/1000*20>100*0.6
    4/a＞0
    4a＞0
    -x^2+110x-2400≤525
    （150-150a%)×80+（180-180a%)×100≥222000
    -0.5-1>0
    x-2（x-3）＞4
    x（1-x）> 3/16
    (x-1)/(x-5)<=0
    (x-1)/(x-5)<0

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