Предмет: Алгебра, автор: aruzhankrasiva1

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Ответы

Автор ответа: р1977
1

1) \:  \frac{1}{7} x - 2 = 0 \\  \\  \:  \:  \:  \:  \frac{1}{7} x = 0 + 2 \\  \\   \:  \:  \:  \frac{1}{7} x = 2 \\  \\  \\  \:  \:  \:  x = 2 \div  \frac{1}{7}  = 2 \times  \frac{7}{1}  \\  \\ x = 14
Ответ: х=14




2) - 0,7х-5=0

- 0,7х=0+5

- 0,7х=5


x = 5 \div ( - 0.7) = 5 \div ( -  \frac{7}{10} ) = 5 \times ( -  \frac{10}{7} ) \\  \\ x =  -  \frac{50}{7}
Ответ: х= - 50/7

Автор ответа: Ксюша060
1
Сначала решаем первое уравнение:
1/7x-2=0
1/7x=2
x=2 : 1/7
x=14

Потом решаем второе уравнение

-0,7x-5=0
-0,7x=5
x=5:(-0,7)
x=-7 1/7

и перемножаем корни 14×(-7 1/7)= -100
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