210x+90*(18-x)≥2100
    900n-100n^2<2000(1.2^n-1)
    1/x+x>20 1/x+x<40
    2x>20
    2x> 20
    9*(t^2)-34*t+25≥0
    570*x/(935641+x)*5-x*0.003 >0.1
    570*x/(935640+x)*5-x*0.002 > 0.1
    570*x/(935640+x)*5-x*0.003 > 0.1
    7+2k/13>0
    x+1<999999
    40000*x/(126584759+40000)*4.69-40000*0.003>0.1
    40000*x/(126584759+40000)*4.69-40000*0.003>0
    x*40000/(126584759+40000)*4.69-40000*0.003>0
    10000*40000/(126584759+40000)*4.69-40000*0.003>0.1
    x*40000/(126584759+40000)*4.69-40000*0.003>0.1
    x * 40000 / ( 126584759.83 + 40000 ) * 4.69 - 40000 * 0.003>0.1
    81391.9*x/(126584759.83+x)*4.69-x*0.003 >0.16
    81391.9*x/(126584759.83+x)*4.69-x*0.003 >0.17
    81391.9*x/(126584759.83+x)*4.69-x*0.003 >0.18

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