12<14x<14
    11<14x<13
    10<13x<12
    10<11x<12
    5<4x<7
    1920x+69600＞2160x+54000
    1920x+69600＞210x+54000
    (1500*a-1000)/1000>5%
    -1/20000 <1/2 *(-41000+2x)/((21000-x)(20000-x))
    x^2-3000x+1000000<0
    x^4-10x^3+33x^2-40x+10>0
    0.75^n＜0.1
    a+3>2-3a>0
    a+3a>2-3a>0
    （lnx）2+lnx＜0
    5x大于10851282
    5x大于10
    x+3>=1 -3+x>5 3x>-2 -2x<-3 -x+1<4 -x-1>=0
    2lnx＞xln2
    3x∧3－8x∧2＋6x＞13÷9

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