Why do I want to go to America. Let's say, because I really like this country. She is very big and beautiful. There are a lot of cities in it. I want to see New York, Los Angeles and Disneyland. I want to see Niagara Falls. See the statue of liberty. In America they make my favorite phones and Arles watches. I wonder what Hollywood is and how movies are made there. See the Florida cosmodrome and crocodiles. I want to lie on the beaches of Mayami. I want to take a paddle boat trip on the Mississippi River. Visit the White House. To see the president of a great country. !
(7^-7*7^-8) /(7^-13)=7^(-7-8) / 7^-13=7^-15 / 7^-13=7^[-15-(-13)]=7^(-15+13)=7^-2=1/7^2=1/49
ответ: 1/49