1/(10(1-r^2))-r^2>(1/5)
    (1/5)+r^2-1/(10(1-r^2))>0
    1/(10(1-r^2))-(1/5)-r^2>0
    cosx-2sinx＞0
    x^2/1<0.0025
    x-1.65√x-50≤0
    x²-1.65x-50≤0
    5%＜（200+7%+x*4%/200+x）*100%＜6%
    5%＜200+7%+x*4%/200+x＜6%
    5%＜200+7%+x*4%/200+x＜6%
    x²－6x+5≤0
    x²-x+1/4<0
    0.004n-0.143676√n-25≥0
    abs(1-100*x+5000*x^2-1000000/6*x^3+100000000/24*x^4)<1
     25x2-10x+1>0
    （x²＋x）＞（x+3）²
    （x-1）*（-3x-2)＞-1
    （3x-2）*（x-1）＜1
    3x²-5x+2＜1
    x^3-3x-2＞0

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