This summer I spent with my grandmother. We had fun, and not only rested well and worked, helped my beloved grandmother. We went to the river, there were a lot of people and I met a company of boys. We still communicate despite the distance. When I arrived home to my parents, I saw that my parents decided to surprise me by putting a huge pool that was the best summer of my life
8х-3у=7 и 3х+у=9 второе уровнение домножаем на 3 получается: 9x+3y=18
8x-3y=7
+
9x+3y=27
_________
17x=34
x=2
тогда 16-3y=7
-3y=-9
y=3
Ответ:(2;3)
5x - 5 - 4x + 12 = - 20
x = - 20 - 7
x = - 27
8b² - 4b³ + 10b⁴ = 10b⁴ - 4b³ + 8b² = 2b²( 5b² - 2b + 4)