<p>PRES -L2 homework page 5</p><p>BTVN bài 2 trang 5</p>

<p>RS2-L27 homwork page 43</p>

<p>TDL2-L23 homework page 24</p>

<p>TDL2-L23 homework page 24</p>

<p>RS2-L26 homework page 42</p>

<p>TDL2-L22 homework page 23</p>