109x+119>399
    10-2/3（x-2）<1/2（x-1）
    14*(1-(5/7)^n)<13
    n^(2)-n-60≥0
    3x-（x+2）/4>（2x-5）/6
    -13<4k+k^2<12
    407.9*1000000 <14.3 * 1200 * x * 0.92 * ( 930 - 0.5 * x )
    407.9<14.3*1200*x*0.92*(930-0.5*x)
    -13<2k+k^2<12
    -13
    -13
    -x>2x
    x≤5
    4x+2-3+9x<1
    2^x<1
    x^2-5x-6<0
    2^x>1
    x^2-3x>0
    960+200(30-a)>2880
    960+200(40-a)>2880

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