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
Х-у=5
у=х-5
х 0 3
у -5 -2
х+2у=-1
2у=-х-1
у=-0,5х-0,5
х -3 3
у 1 -2
Строим точки,проводим прямые
Точка пересечения (3;-2)
7х²-28х-6х-х²=6х²-34х
5аb(4a+3b-20a²b+40a²) = 20a²b+15ab²-20a²b+200a³b=15ab² + 200a³b (не совсем уверена, т.к. не очень поняла в написании задания)
2х²у-11ху²-х²у-14ху²=х²у-25ху²
20с^4 - 15 c^3 - 16c^4 + 24c^2 = 4c^4 - 15c^3 = 24 c^2
60+60=120
70+70=140
80+80=160
90+90=180
Ответ икс равно минус 2.5