Toán Lớp 9: Cmr: 5/( √x + 1) > 0 ( √x lớn hơn 0)
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Toán Lớp 9: Cmr: 5/( √x + 1) > 0 ( √x lớn hơn 0)
Comments ( 2 )
Ta có: \sqrt{x}+1>0∀x>0
Mà 5>0
=>\frac{5}{\sqrt{x}+1}>0(đpcm)