Question

10баллов даююю!!!!!!!!!!!!!

Answer 1

Ответ:

10) 16

11) 1,7

12) -0,5

Объяснение:

$10) \: \frac{ {a}^{ - 11} \times {a}^{4} }{ {a}^{ - 3} } = {a}^{ - 11} \times {a}^{4} \times ( {a}^{ - 3} )^{ - 1} = { a}^{ - 11 + 4} \times a^{3} = {a}^{ - 7 + 3} = a ^{ - 4} = > ( - \frac{1}{2} ) ^{ - 4} = ( -( 2 ^{ - 1} )) ^{ - 4} = 2 ^{ - 4 \times ( - 1)} = 2 ^{4} = 16$

$11) \: \frac{(a - 2b) ^{2} - 4b^{2} }{a} = \frac{(a - 2b + 2b)(a - 2b - 2b)}{a} = \frac{a(a - 4b)}{a} = a - 4b = > 0.3 - 4 \times ( - 0.35) = 0.3 + 1.4 = 1.7$

$12) \: \frac{b}{ {a}^{2} + ab } \div \frac{b ^{2} }{a ^{2} - {b}^{2} } = \frac{b}{a(a + b)} \times \frac{(a - b)(a + b)}{ {b}^{2} } = \frac{(a - b)}{ab} = > \frac{ \sqrt{5} - 1 - \sqrt{5} - 1 }{ (\sqrt{5} - 1)( \sqrt{5} + 1)} = \frac{ - 2}{ { \sqrt{5} }^{2} - 1 } = \frac{ - 2}{5 - 1} = \frac{ - 2}{4} = \frac{ - 1}{2} = - 0.5$

ФСУ:

a²-b² = (a-b)(a+b)