45dm45cm=495cm

23cm²=0,23dm²

3m²5dm²=3,03m²

NaNO_3:

K₂SO₄:

\(a.B=\sqrt{16x+16}-\sqrt{9x+9}+\sqrt{4x+4}+\sqrt{x+1}\\ =2\sqrt{x+1}-3\sqrt{x+1}+2\sqrt{x+1}+\sqrt{x+1}\\ =2\sqrt{x+1}\)

b. để B=16⇒\(2\sqrt{x+1}=16\)

\(2\sqrt{x+1}=16\\ \Leftrightarrow\sqrt{x+1}=8\\ \Rightarrow x+1=64\\ \Leftrightarrow x=63\)

vậy với x=63 thì B có giá trị là 16

xin phép làm lại:

\(\sqrt{x-2}< 3\\ \Rightarrow\left\{{}\begin{matrix}x-2\ge0\\x-2< 9\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x\ge2\\x< 11\end{matrix}\right.\\ \Rightarrow2\le x< 11\)

vậy....

\(\sqrt{x-2}< 3\\ \Rightarrow x-2< 9\\ \Leftrightarrow x< 11\)

vậy....

→Despite of the difficult english grammar,we like to study it