(x-387)÷x=400÷1000
    (x-387)/x=400/1000
    (x-387):x=400:1000
    x-3<0
    x-3（x-2）≥4
    x+1>0 3x-8≤-x
    x*255>x*0+(1-0)
    x^2+x-6<0
    x<=x+(1-1)
    x
    1/6≤(1-p)^5 2/6≤(1-p)^5+5*p*(1-p)^4 3/6≤(1-p)^5+5*p*(1-p)4+10*p^2*(1-p)^3 4/6≤(1-p)^5+5*p*(1-p)4+10*p^2*(1-p)^3+10*p^3*(1-p)^2 5/6≤(1-p)^5+5*p*(1-p)4+10*p^2*(1-p)^3+10*p^3*(1-p)^2+5*p^4*(1-p)
    1/6≥(1-p)^5 2/6≥(1-p)^5+5*p*(1-p)^4 3/6≥(1-p)^5+5*p*(1-p)4+10*p^2*(1-p)^3 4/6≥(1-p)^5+5*p*(1-p)4+10*p^2*(1-p)^3+10*p^3*(1-p)^2 5/6≥(1-p)^5+5*p*(1-p)4+10*p^2*(1-p)^3+10*p^3*(1-p)^2+5*p^4*(1-p)
    1/6≥(1-p)^5 2/6≥(1-p)^5+5*p*(1-p)^4 3/6≥(1-p)^5+5*p*(1-p)4+10*p^2*(1-p)^3 4/6≥(1-p)^5+5*p*(1-p)4+10*p^2*(1-p)^3+10*p^3*(1-p)^2 5/6≥(1-p)^5+5*p*(1-p)4+10*p^2*(1-p)^3+10*p^3*(1-p)^2+5*p^4*(1-p) 1≥(1-p)^5+5*p*(1-p)4+10*p^2*(1-p)^3+10*p^3*(1-p)^2+5*p^4*(1-p)
    1/6>(1-p)^5
    4x-1/3-x>1
    3/3x-1-2/x+5
    3/3x-1-2/x+5>-1
    3/3x-1-2/x+5>- 1
    3/3x-1-2/x+5>=-1
    2*x-1>3*x-5

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