Mathematics
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    X²-10x十x+21<0
    24000(20-5x÷2)x%≥9000
    2.4(20-5x÷2)(1+x%)≥9000
    24000(20-5x÷2)(1+x%)≥9000
    (x-1)÷2>(2x+5)÷3
    (x+3)÷(5-x)>1
    a-1<1-a^2
    -1<1-a^2<1
    x+12/x+4>-1
    x+12:x+4>-1
    (2x-1)/(x+1)≥0
     5(x-1)/(2-x)≥0
    5(x-1)/2-x≥0
    100<100(1+x)0.9<103
    X(24-2X)>35
    x^3-6x^2+6x-x≤0
    (40-x)(10+x)≥600
    13-4x²>0
    e^((-3.1415926535*x)/sqrt(1-x^2))<0.35
    k^2+2k-7≥0

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