Question

Пожалуйста помогите 10 11 12 задания

Answer 1

10)
2х + y = 2
6x - 2y = 1

y = 2 - 2x
6x - 2*(2 - 2x) = 1

y = 2 - 2x
6x - 4 + 4x = 1

y = 2 - 2x
10x = 5

y = 2 - 2x
x = 5/10 = 0.5

x = 0,5
y = 2 - 2*0,5 = 2 - 1 = 1

Ответ: (0,5; 1)

11)
$( \frac{b}{ {a}^{2} + ab} + \frac{2}{a + b} + \frac{a}{ {b}^{2} + ab} ) \div \frac{ {a}^{2} - {b}^{2} }{4ab} = ( \frac{b}{a(a + b)} + \frac{2}{a + b} + \frac{a}{b(b + a)} ) \div \frac{ {a}^{2} - {b}^{2} }{4ab} = \frac{ {b}^{2} + 2ab + {a}^{2} }{ab(a + b)} \div \frac{ {a}^{2} - {b}^{2} }{4ab} = \frac{ {(a + b)}^{2} }{ab(a + b)} \times \frac{4ab}{ {a}^{2} - {b}^{2} } = \frac{a + b}{ab} \times \frac{4ab}{(a - b)(a + b)} = \frac{4}{a - b}$

12) (2x)^6*(x^3)^4 = 2^6*x^6*x^12 = 2^6*x^18 = 64x^18
Ответ: В)