x²+2x+1＜0
    1+2*a^3-3*a^2>0
    4×20×1000÷3.14÷x^2+32×8×1000÷3.14÷x^3≤40×1000000
    1/x+1≤1
    2x+cosx＞0
    2x^2-5x+3＜0
    2x^2-5x+3＜0
    200（5x+1-x/3）≥3000
     -1/m-[1/(m^2)-(2/m)+6]^(1/2)>0
     -1/m+[1/(m^2)-(2/m)+6]^(1/2)>0
     {-1/m+[1/(m^2)-(2/m)+6]^(1/2)}^2-8>0
     {-1/m-[1/(m^2)-2/m+6]^(1/2)}^2-8>0
     {-1/m+[1/(m^2)-2/m+6]^(1/2)}^2-8>0
     {1/m+[1/(m^2)-2/m+6]^(1/2)}^2-8>0
    1/m+[1/(m^2)-2/m+6]^(1/2)>0
    2^x/ln7-x≥1
    2^x/ln7-x<0
    xx+3x≥0
    x²+2x+4＞0
    x²+2x+1＞0

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