Напишите уравнения проведённых реакций:

1) в состав хлорида аммония входят ионы NH4+ и Cl-

2) в сосав сульфата аммония входят ионы NH4+ и SO42-

 

 

                                          ПОМОГИТЕ ПОЖАЛЙСТА!

 

В массиве хранится информация о результатах 25 спортсменов, уча­ствовавших в лыжной гонке. Определить результат спортсмена- победителя гонки.

Complete the texs with the definite article the if necessary.

I live in one of the most beautiful cities of the world. Sometimes ... St Petersburg is called the second capital of ... Russian Federation. Tourists from different countries come to ... St Petersburg to visit its famous museums and to walk along ... Nevsky Prospect. You can see tourists from ... France and ... United States, ... China and ... Great Britain in ... Dvortsovaya Square. There are also lots of Russian tourists from ... Krasnodar and ... Vladivostok, from ... Kaliningrad and ... Moscow. Would you like to visit ... St Petersburg some day? 

решите:

1) n!/(n-1)!

2) (2л+1)!.(2л-1)!

3) n!=7(n-1)!

4) (m+17)!=420(m+15)!

Complete the text. Put the verbs in the Present Simple or the Present Continuous(Progressive).

I am sitting (sit) in the park and I ... (write) my notes at the moment. It ... (be) hot. I ... (hate) this hot weather. I ... not ... (want) to sit here. But Roger ... (play) tennis with his friend. They ... (run) and ... (laugh). They ... not ...(ask) for any ice cream or cold lemonade. They ... (have) fun. They ... (like) the hot weather.

Oh, but I ... (see) an ice cream man! Ice cream ... (be) cold and tastes great. Now I ... (be) happy.