I spend my summer holidays at my granny’s. There are many things there to do. What I did most of the time - I swam in the sea and sunbathed. Sometimes I made a fire with my friends at the seaside and cooked potatoes there. It was wonderful. We told anecdotes to each other, and did everything we wanted. I also got used to walk alone in the forest.
When August was coming to its end, I went on a small voyage by ship. The ship name was “Sevastopol”.
But this summer wasn’t for me only sugar and honey. I have passed through the graduating exams after school and entering exams in the university. So the bigger part of my summer vacations I spent sitting with the books. Of course, it was not interesting, but I’m glad that I did it because now I’m a student of the best university in our country.
1) - 0,15 × 20/21 + 1 × 4/7 ÷ ( - 3 × 1/7 ) = -3/20 × 20/21 + 4/7 ÷ ( - 3/7 ) = -1/7 + 4/7 × ( - 7/3 ) = - 1/7 - 4 × 1/3 = - 1/7 - 4/3 = - 31/21
2) x + 5,1 - 7,3 - x + 1, 2 = -1
3) ( x - 0,2 )(1/6 + x ) = 0
( x - 1/5 )(1/6 + x ) = 0
x - 1/5 = 0
1/6 + x = 0
x1 = -1/6 ; x2 = 1/5