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Mamonga
Mamonga
18.09.2022 13:11 •  Алгебра

Сколько корней имеет уравнение х^2-2х+4=0​

👇
Ответ:
kpnkipm
kpnkipm
18.09.2022

x² - 2x + 4 = 0

Найдем дискриминант квадратного уравнения:

D = b² - 4ac = (-2)² - 4·1·4 = 4 - 16 = -12

Так как дискриминант меньше нуля, то уравнение не имеет действительных решений.

4,7(90 оценок)
Ответ:
Qucha
Qucha
18.09.2022

Объяснение:

D=4-16= -12

D<0 , то уравнение не имеет действительных корней.

4,4(33 оценок)
Открыть все ответы
Ответ:
bogdanlesja1
bogdanlesja1
18.09.2022

а) 0.36; б) 0.91; в) 0.55

Объяснение:

а) ровно одно попадание

(первый выстрел удачный, второй и третий нет либо

второй удачный, первый и третий нет либо

третий удачный, первый и второй нет)

0.4*(1-0.5)*(1-0.7)+(1-0.4)*0.5*(1-0.7)+(1-0.4)*(1-0.5)*0.7=

0.4*0.5*0.3+0.6*0.5*0.3+0.6*0.5*0.7=

0.06+0.09+0.21=0.36

б) хотя бы одно попадание

(1 - ни разу не промахнулся)

1-(1-0.4)*(1-0.5)*(1-0.7)=1-0.6*0.5*0.3=1-0.09=0.91

в) ( два выстрела удачный, третий нет, либо

все три удачные)

0.4*0.5*(1-0.7)+(1-0.4)*0.5*0.7+0.4*(1-0.5)*0.7+0.4*0.5*0.7=

0.4*0.5*0.3+0.6*0.5*0.7+0.4*0.5*0.7+0.4*0.5*0.7=

0.06+0.21+0.14+0.14=0.55

(0.91-0.36=0.55)

4,6(95 оценок)
Ответ:
nikitaaleksandrov
nikitaaleksandrov
18.09.2022

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

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

are my grandparents. They are riding bikes.

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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.

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

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

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4,4(29 оценок)
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