Giá vẻ trẻ em là:

\(2800000\cdot75\%=2100000\left(đồng\right)\)

Số tiền nhà bạn An phải trả là:

\(\left(2\cdot2800000+2\cdot2100000\right)\left(1-20\%\right)=0,8\cdot9800000=7840000\left(đồng\right)\)

Ta có: \(n_{H_2}=\dfrac{4,958}{24,79}=0,2\left(mol\right)\)

PT: \(Zn+H_2SO_4\rightarrow ZnSO_4+H_2\)

___________0,2_____________0,2 (mol)

\(\Rightarrow m_{H_2SO_4}=n_{H_2}=0,2\left(mol\right)\)

\(\Rightarrow C\%_{H_2SO_4}=\dfrac{0,2.98}{200}.100\%=9,8\%\)

mạng nha bn :))
 

có ai giúp mình không

\(\dfrac{6}{7}\cdot\dfrac{8}{13}+\dfrac{6}{13}\cdot\dfrac{9}{7}-\dfrac{4}{13}\cdot\dfrac{6}{7}\)

\(=\dfrac{6}{7}\left(\dfrac{8}{13}+\dfrac{9}{13}-\dfrac{4}{13}\right)\)

\(=\dfrac{6}{7}\cdot\dfrac{13}{13}=\dfrac{6}{7}\)

   \(\dfrac{6}{7}\).\(\dfrac{8}{13}\) + \(\dfrac{6}{13}\).\(\dfrac{9}{7}\) - \(\dfrac{4}{13}\).\(\dfrac{6}{7}\)

=  \(\dfrac{6}{7}\).\(\dfrac{8}{13}\) + \(\dfrac{6}{7}\).\(\dfrac{9}{13}\) - \(\dfrac{4}{13}\).\(\dfrac{6}{7}\)

= \(\dfrac{6}{7}\).(\(\dfrac{8}{13}\) + \(\dfrac{9}{13}\) - \(\dfrac{4}{13}\))

= \(\dfrac{6}{7}\).1

= \(\dfrac{6}{7}\)

Quãng đường còn lại ứng với phân số là:

           1  - \(\dfrac{2}{3}\) = \(\dfrac{1}{3}\) (quãng đường)

Quãng đường còn lại dài số ki-lô-mét là:

          42 x \(\dfrac{1}{3}\) = 14 (km)

Kết luận: Quãng đường còn lại dài 14km

3. Peter is interested in carving eggshells.

4. In spite of being young, he perfoms excellently.

5. It is about five kilometers from my village to the nearest town.

6. There used to be a bus stop in the city.

Em tham khảo nhé

1. https://olm.vn/chu-de/bai-9-tho-nhuong-viet-nam-2195279442

2. https://olm.vn/chu-de/bai-10-sinh-vat-viet-nam-2195570937

3 và 4. https://olm.vn/chu-de/bai-12-moi-truong-va-tai-nguyen-bien-dao-viet-nam-2195574189

5. https://bacgiang.gov.vn/chi-tiet-bien-dao-vn/-/asset_publisher/YiOFlAxwJhRr/content/19-hoc-sinh-sinh-vien-viet-nam-can-co-y-thuc-va-trach-nhiem-nhu-the-nao-trong-su-nghiep-bao-ve-chu-quyen-bien-ao-cua-ta-tren-bien-ong-