\(\sqrt{16x}=8\Leftrightarrow16x=64\Leftrightarrow x=4\)

-125 bn ơi

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cho nguyên bài mới giải đc

\(n_{NaCl}=2,5.0,1=0,25\left(mol\right)\)

A

D

C

Ta có: x²+4x+5=(x²+4x+4)+1=(x+2)²+1≥1

Dấu "=" xảy ra ⇔ x=-2