x<3 1/x
    4≤0.6(5+x)
    x^2+x>2
    0.004n-0.13761√n-25>0
    (1/5)+（r^2）-（1/(10(1-r^2))>0
    （r^2）-（1/(10(1-r^2))>-(1/5)
    r^2-1/(10(1-r^2))>-(1/5)
    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

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