6 класс. Что происходит на экваторе??????

 

Вычислите: arccos(tgПИ/4) sin(arccos0)

you remember the five people in the Lambert family, don't you? there are Mr. Lambert, Mrs.Lambert and three children. the children's names are Peter, Kate and Bill. Today is Monday. everybody in the Lambert family _(is/are) busy. Mr. Lambert is in his garage. he _(fixes/fixing) a car.

Mr. Lambert is a housewife. she is in the kitchen now. she _(cooks/is cooking) dinner.

Peter, Kate and Bill are in school now. Peter is in a classroom. he _studies/is studying) physics.

Kate is in thr music room_(plays/is playing) a guitar.

Bill is in the art room. he_(paints/is painting) a picture.

What _(is/are) you doing now? What _(is/are) everybody in your family doing now?

Найдите значение произведения, используя равенство 4,6*1,5=6,9

1) -4,6*1,5

2) -4,6*(-1,5)

3) -2*(-4,6*1,5)

4) -2*(-4,6)*(-1,5)

5) -2*(-5)*(-4,6)*(-1,5)

6) -3*(-4)*(-5)*(-4,6)*(-1,5)

составьте структурную формулу, 2 гомолога и 2 изомера

2,4-дихлорпентен-1