прямая AM перпендикулярна к плоскости квадрата ABCD, диагонали которого пересекаются в точке O. Докажите что прямая BD перпендикулярна к плоскости AMO. MO перпендикулярна BD.

Во сколько раз изменится период колебаний груза, подвешенного на резиновом жгуте, если отрезать 3/4 длины жгута и подвесить на оставшуюся часть тот же груз

избавится от иррациональности в дроби 1/sqrt(5)-2

С Turn the following sentences into reported speech. Use ask, advise, agree, refuse, complain, promise.

1. "Don't phone Liz now," he said.

2. "Will you help me?" she asked. "Never," he said.

3"Would you like some juice?" Bill asked. "Yes, please," Lisa said.

4. "May I give you some advice?" he said to the woman.

5. "I have a toothache," the girl cried.

6. "Of course I'll lend you the money," her brother said to her.

7. "I'll do my best to come back by 10 o'clock," Wendy said to her mother

Test 2.

I ____ (to shop) for clothes with my elder sister on Sunday