X＜20-X
    －41800+30000＋x－150000×12%÷4－x×10%/4≥3000
    41800－30000+x－150000×12%÷4－x×10%/4≥300
    -1x<2
    x≥x^x
    x＞x^x
    x＜x^x
    8x-1/x^2>0
    8x-1/x*x>0
    8x-1/x*x>1/8
    x*x*x>1/8
    -x-3＞0
    m+1>0 2m-2>0
    2≤3x-7<8
    3+x>x/2+1
    (x+2)/2>(x+3)/3
    (x+4)/2<2
    5-2(x+1)<3-6x
    -3x-1>3
    -2.0639<(5.5-x)/(1.73/5)<2.0639

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