Mathematics
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    x>sinx
    4/x-9/x+1=0(x>0
    (n-1)*(7/8)^n-1≤n(7/8)^n
    22+208-162-10-25-18-18×6%/12-120×9%/12+W-W×6%/12≥20
     -450 - 690 + X - X × 0.02 >500
    -450-690+X-X×0.02>500
    -1000-20000*6%/4-50000*8%+x-x*6%/4大于等于5000
    3.5*x^2+1.47*x-0.19644>0
    x²-2x-3>0
    -4/a>-1
    -4/a<=-1
    x^2+x>=0
    ln(3x+4)>=0
    (3-x)/(2x+1)>=1
    x-3<2x+5<7
    x²+2x≤5040
    4x(x^2+2x+1)≥0
    1-((x-1)/(x+1))^2≥0
    (6+x)/(11+x)>60%
    4x^2-100 x+1200大于0

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