Question

ПОМОГИТЕ СРОЧНО ДАМ 20 БАЛЛОВ

Answer 1

Ответ:

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Answer 2

б)

$\frac{ {x}^{2} + 5x }{14} + \frac{10 - 2 {x}^{2} }{7} = 5$

$4 {x}^{2} + 5x + 2(10 - 2 {x}^{2} ) = 70$

$4{x}^{2} + 5x + 20 - 4 {x}^{2} = 70$

$5x + 20 = 70$

$5x = 70 - 20$

$5x = 50$

$x = 10$