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Me2mini
Me2mini
04.12.2022 02:41 •  Алгебра

Квадратное уравнение
г)9x^2-82x+9=0 ​

👇
Ответ:
Дерюгин
Дерюгин
04.12.2022

x1 = 1/9; x2 = 9

Объяснение:

9x^2 - x - 81x + 9=0

x(9x - 1) - 81x + 9=0

x(9x - 1) - 9(9x - 1) =0

(9x - 1)(x - 9) = 0

9x - 1 =0 (1)

x - 9 = 0 (2)

1:

x = 1/9

2:

x = 9

4,4(93 оценок)
Ответ:
ekaterina123sve
ekaterina123sve
04.12.2022

x_{1}=9\\x_{2}=\frac{1}{9}\\

Объяснение:

Решаем данное уравнение через дискриминант, так как оно не является приведенным:

9x^2-82x+9=0\\a=9; b=-82; c=9\\D=b^2-4ac\\D=(-82)^2-4*9*9\\D=6724-324\\D=6400\\\sqrt{D}=\sqrt{6400}=80\\x_{1}=\frac{-b+\sqrt{D}}{2a}=\frac{-(-82)+80}{2*9}=\frac{82+80}{18}=\frac{162}{18}=9\\x_{2}= \frac{-b-\sqrt{D}}{2a}=\frac{-(-82)-80}{2*9}=\frac{82-80}{18}=\frac{2}{18}=\frac{1}{9} \\

4,6(28 оценок)
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Ответ:
nikitaaleksandrov
nikitaaleksandrov
04.12.2022

阿迪爾汗

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are my grandparents. They are riding bikes.

is our house. I can see it from here.

are my parents. My Mom’s name is Ann and my father’s name is Tom

is my mother. She has baked a delicious strawberry pie.

are my grandparents. They are riding bikes.

is our house. I can see it from here.

are my parents. My Mom’s name is Ann and my father’s name is Tom

is my mother. She has baked a delicious strawberry pie.

are my grandparents. They are riding bikes.

is our house. I can see it from here.

are my parents. My Mom’s name is Ann and my father’s name is Tom

is my mother. She has baked a delicious strawberry pie.

are my grandparents. They are riding bikes.

is our house. I can see it from here.

are my parents. My Mom’s name is Ann and my father’s name is Tom

is my mother. She has baked a delicious strawberry pie.

are my grandparents. They are riding bikes.

is our house. I can see it from here.

are my parents. My Mom’s name is Ann and my father’s name is Tom

is my mother. She has baked a delicious strawberry pie.

are my grandparents. They are riding bikes.

is our house. I can see it from here.

are my parents. My Mom’s name is Ann and my father’s name is Tom

is my mother. She has baked a delicious strawberry pie.

are my grandparents. They are riding bikes.

is our house. I can see it from here.

are my parents. My Mom’s name is Ann and my father’s name is Tom

is my mother. She has baked a delicious strawberry pie.

are my grandparents. They are riding bikes.

is our house. I can see it from here.

are my parents. My Mom’s name is Ann and my father’s name is Tom

is my mother. She has baked a delicious strawberry pie.

are my grandparents. They are riding bikes.

is our house. I can see it from here.

are my parents. My Mom’s name is Ann and my father’s name is Tom

is my mother. She has baked a delicious strawberry pie.

are my grandparents. They are riding bikes.

is our house. I can see it from here.

are my parents. My Mom’s name is Ann and my father’s name is Tom

is my mother. She has baked a delicious strawberry pie.

are my grandparents. They are riding bikes.

is our house. I can see it from here.

are my parents. My Mom’s name is Ann and my father’s name is Tom

is my mother. She has baked a delicious strawberry pie.

are my grandparents. They are riding bikes.

is our house. I can see it from here.

are my parents. My Mom’s name is Ann and my father’s name is Tom

is my mother. She has baked a delicious strawberry pie.

are my grandparents. They are riding bikes.

is our house. I can see it from here.

are my parents. My Mom’s name is Ann and my father’s name is Tom

is my mother. She has baked a delicious strawberry pie.

are my grandparents. They are riding bikes.

is our house. I can see it from here.

are my parents. My Mom’s name is Ann and my father’s name is Tom

is my mother. She has baked a delicious strawberry pie.

are my grandparents. They are riding bikes.

is our house. I can see it from here.

are my parents. My Mom’s name is Ann and my father’s name is Tom

is my mother. She has baked a delicious strawberry pie.

are my grandparents. They are riding bikes.

is our house. I can see it from here.

are my parents. My Mom’s name is Ann and my father’s name is Tom

is my mother. She has baked a delicious strawberry pie.

are my grandparents. They are riding bikes.

is our house. I can see it from here.

are my parents. My Mom’s name is Ann and my father’s name is Tom

4,4(29 оценок)
Ответ:
misha666anibeat
misha666anibeat
04.12.2022
Пусть х-это скорость течения реки.Тогда скорость по течению реки будет (18+х),а против течения реки будет (18-х). Составим уравнение 50 км/(18+х) + 8км/(18-х) = 3 часа 50·(18-х) + 8·(18+х) - 3·(18+х)·(18-х) =0 (только х≠18 , чтобы знаменатель не был равен нулю) 900 -50х + 144 + 8х - ( 54+3х)·(18-х)=0 1044 -42х - (972-54х+54х-3х²)=0 1044 - 42х -972 +54х -54х +3х²=0 3х²-42х+72=0 разделим всё на 3,каждый член, для облегчения решения х²- 14х+ 24 =0 Д=196-4·1·24=100 х= 12 и х=2 Скорость реки не может быть почти равной скорости теплохода, поэтому х=12 мы не принимаем за ответ. ответ: х=2км/ч
4,5(26 оценок)
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