Question

решите уравнение пожалуйста ​

Answer 1

$8x - 15 + 7x = 2x + 50 \\ 15x - 15 = 2x + 50 \\ 15x - 15 - 2x = 50 \\ 13x - 15 = 50 \\ 13x = 50 + 15 \\ 13x = 65 \\ x = \frac{65}{13} \: \: \: \: \: \: \: \\ x5$

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$2 \times |x - 4| = 6 \\ 2 |x - 4| = 6 \\ |x - 4| = 3 \\ x - 4 = 3 \\ x - 4 = - 3 \\ x = 7 \\ x = 1$

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Answer 2

Ответ:

$1)\ \ 8x-15+7x=2x+50\\\\15x-15=2x+50\\\\15x-2x=50+15\\\\13x=65\\\\x=5$

$2a)\ \ \ \ 2\cdot |\, x-4\, |=6\ \ \ \Rightarrow \ \ |\, x-4\, |=3\ \ \Rightarrow \ \ (x-4)=\pm 3\\\\a)\ \ x-4=-3\ \ ,\ \ x=-3+4\ \ ,\ \ \ x=1\\\\b)\ \ x-4=3\ \ ,\ \ x=3+4\ \ ,\ \ x=7\\\\Otvet:\ \ x_1=1\ ,\ x_2=7\ .$

$2b)\ \ \ \ 12\cdot |\, 2x-5\, |=-60\ \ \ \Rightarrow \ \ |\, 2x-5\, |=-5\ \ \Rightarrow \ \ \\\\x\in \varnothing ,\ tak\ kak\ \ |2x-5|\geq 0\ \ pri\ \ x\in (-\infty ;+\infty )\ .\\\\Otvet:\ \ x\in \varnothing \ .$