1+m>=(m-1)^2
    －4940＋a－a×2%≥6000
    (2k+1)^2-4k^2>0
    2^x大于x^2
    2^x大于4×x^2
    2x大于4×x^2
    2x大于x^2
    2x大于4x
    50*x/(50+x)<50
    50*x/(50+x)>50
    x≤3x^3一3
    x≤x^3一3
    x≤x^3一3
    x^3一3
    231*(19-x) > 0.03*(36944.52-1944.44*x)
    231*(19-x) < 0.03*(36944.52-1944.44*x)
    X-550－（1000×6%/12＋1500×8%/12＋X×6%/12）≥50
    a^6>9*a^4+900a^2
    1-x＜x^2-1
    X(1-x)>0

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