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
    -（2a-1）^2-4（a-2）（a+0.5）≥0
    1.05^x-5.5%x>0
    -450 + e -690 - e * 8 % / 4 ≥500
    -450+E-690-E*8%/4≥500
    5000-5000(1-X)^3>3*5000*X
    x*x*x*x<8*x*x+9
    －2x＞-5

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