С неподвижной лодки  массой 50 кг на берег прыгнул мальчик массой  40 кг со скоростью 1 м/с относительно берега,направленной горизонтально.Какую скорость относительно берега приобрела лодка?Сопротивлением  воды принебречь.

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Dear Kelly, I was at the circus on Sunday. It was very interesting! There were two funny clowns. Their noses were red and their hair was orange. There were many animals too. I was happy! Where were you on Sunday? Love, Mary.

Вопросы:

1) Where was Mary on Sunday?

2) How many clowns were there?

3) What colour were the clown's noses?

4) What colour were the clown's hair?

5) Who was happy?

какие виды растений и животных завезены в Россию из других стран?когда?

выполните действия1) 5 7/10 +3 9/10 +1 3/10=                        2) 8- 4 31/100-2 57/100=