Объясните что называет серединным перпендикуляром к отрезку?

из 28 костей домино неудачу извлечена кость. найти вероятность , что сумма очков на ней будет равно :

1.четырем

2.шести

3.двенадцати

4.тринадцати

Упростить выражение 9 класс Прогрессия

(1+х+x^2+........+x^23)/(1+x+x^2........+x^7)     Всё что я знаю это первым действием находим кол-во членов геометричесской последовательности в знаменателе и сколько  членов геометричесской последовательности в числителе ...а может вы подругому как то сделаете если сможете..

написать 5 предложений с указательными местоимениями только из СКАЗОК пушкина

CРОЧНО!! Посмотрите пересказ, и исправьте ошибки ,если не сложно : This is the story of how the two met opinions. The patient had one opinion, the surgeon another one. It was very difficult operation and the patient was nervous. He had sick heart. But he wanted a metallic heart. He believed that it is safe and it never wears out. The surgeon understood that it is wrong decision. The surgeon was for life without metal interference and he couldn't imagine a world in which human are made of half-metal. He tried tell the patient out, but the patient insisted on his opinion. The surgeon was the best. Everyone wanted go under the knife to him. When Metallos became citizens, people began to envy them. But Metallos conversely envied people. Metallos wanted feel and people wanted do unusual things as Metallos do. . I’m sure that hybrids of humans and robots can appear in future. The world does not stand. Every day it develops. Scientists create that something new and sometimes this things is not understand for people. Even now use metal products, replacing the live leg or arm or even the heart. This story teaches us that every person must has his opinion and decision.