\(Sau\) \(hai\) \(lần\) \(bán\) \(cửa\) \(hàng\) \(còn\) \(lại\):\(1-\dfrac{2}{5}-\dfrac{1}{3}=\dfrac{15-6-5}{15}=\dfrac{4}{15}\)(\(tấm\) \(vải\))
\(Vậy\) \(cửa\) \(hàng\) \(còn\) \(lại\) \(\dfrac{4}{15}\) \(tấm\) \(vải\).

19-b
20-d
21-c

\(20\dfrac{7}{13}=\dfrac{20.13+7}{13}=\dfrac{267}{13}\)

\(\dfrac{6}{5}=1\dfrac{1}{5}\)
:V

120.24-150:15+4
=2880-10+4
=2874
12,5+34,5:5+10,5.2
=12,5+6,9+21
=40,4
\(\dfrac{1}{2}\)x\(\dfrac{3}{4}\)-\(\dfrac{1}{6}\)
=\(\dfrac{3}{8}\)-\(\dfrac{1}{6}\)
=\(\dfrac{18-8}{48}\)=\(\dfrac{5}{24}\)
\(3\dfrac{1}{2}+1\dfrac{3}{4}-\dfrac{5}{6} \)=\(\dfrac{7}{2}+\dfrac{7}{4}-\dfrac{5}{6}\)=\(\dfrac{42}{12}+\dfrac{21}{12}-\dfrac{10}{12}=\dfrac{53}{12}\)

1-a
2-b
3-c
4-a
5-b
6-c
7-b
8-d
9-b
10-c

1-are staying
2-go
3-has
4-meet
5-go
6-comes
7-am having
8-does

1-at
2-at
3-at
4-on
5-at
6-in
 

7m3dm8cm=738cm nha

23x8=184