10000000(2x-1)/(2x)-x+1<10000000
    -1<=1-x^2<=1
    0<=x^2<=1
    ln(3+x)>=0
    5t^2+12t-2<=0
    ln(1/x+1)>1/(1/x+1)x
    1/2^n<0.001
    105*(1+x)^15<10*(1+x)^15-10+100*x
    x^3-2x-3>0
    x^3-4x>0
    x^3-4x<0
    1>3sinx^2+sinx^3-sinx^4
    y^2-4y-8≥0
    0.0808*x＋0.0315*(1-x)>0.065 0.0616*x＋0.0074*(1-x)<0.05
    0.0808*x＋0.0315*(1-x)>0.065 0.0616*x＋0.0074*(1-x)<0.045
    0.0808*x＋0.0315*(1-x)>0.06 0.0616*x＋0.0074*(1-x)<0.05
    0.0808*x＋0.0315*(1-x)>0.06
    -1≤2x+1/3≤1
    x(x*x+5x+4)>0
    x+9÷x＞6

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