Лыжник проехал 300 м за 6 секунд. найдите среднюю скорость лыжника на дистанции

Средняя скорость  = расстояние / время = 300м / 6сек= 50м/сек.

У выражение: (√6+√3)×√12-2√6×√3

1. Раскроем скобки:

(√6+√3)×√12=√12×√6+√12×√3=√72+√36=√72+6

2. Представим 72 как произведение 36 и 2:

√72+6=√36×2+6=√36×√2+6=6√2+6

3. Разберём подробнее 2√6×√3:

2√6×√3=2×√6×3=2×√18

4. Представим √18 как произведение чисел 9 и 2:

2×√18=2×√9×2=2×√9×√2=2×3√2=6√2

5. Подставим полученные значения (действия 2 и 4):

(√6+√3)×√12-2√6×√3=6√2+6 - 6√2=6

ОТВЕТ: 6

В одно действие:

(√6+√3)×√12 - 2√6×√3=√12×√6+√12×√3 - 2√18=√72+√36 - 2√9×2=√72+6

- 2×3√2= √36×2+6 - 6√2=6√2+6-6√2=6

Объяснение:

The towel on the wall… It’s our ancient custom. There was not a single Ukrainian house , which would not be decorates with towels. A house without a towel was compared with a family without children.  A towel symbolized not only aesthetic taste , it was a face of a house and of a hostess. The towels proved that the hostess was tidy and hard-working.  

A newly-born child was handed with the towel, guests were met with bread and salt on the towel. A son , a husband, a father were seen off with the towel.  While getting married the  newly-formed family was standing on a towel too. Bread and salt on an embroidered towel were a symbol of hospitality of the Ukrainian people. To take the towel , to kiss bread symbolized unity, peace, love , understanding among people. This custom has a good tradition in our country.

Towel were used in different ceremonies and in everyday life as well: for wiping a face and hands, for drying dishes, for decorating the houses, for presenting dear people. The ornaments and colours of towels were different in different regions. A lot of songs about the embroidered towel have been created in Ukraine. Объяснение: