Question

помогите даю 50 баллов

Answer 1

Ответ:

$1)44 - 2 \sqrt{43 } \\ 2)3 \\ 3)1.4 \\ 4) - 3.2$

Пошаговое объяснение:

1.

$( { \sqrt{41} - 1})^{2} = \\ = {( \sqrt{43}) }^{2} - 2 \times \sqrt{43} \times 1 + {1}^{2} = \\ = 43 - 2 \sqrt{43 } + 1= \\ = 44 - 2 \sqrt{43}$

2.

При с =1/15

$5c - \frac{25 {c}^{2} + 1 }{5c} = \\ = \frac{5c \times 5c - 25 {c} + 1^{2} }{5c} = \\ = \frac{25 {c}^{2} - 25 {c}^{2} + 1 }{5c} = \frac{1}{5c} = \\ = \frac{1}{5 \times \frac{1}{15} } = \frac{15}{5} = 3$

3.

При

$a = - 1.2 \\b = 2$

$0.5a + b = \\ = 0.5 \times ( - 1.2) + 2 = \\ = - 0.6 + 2 = 1.4$

4.

При

$a = - 2 \\ b = - 2.4$

$a + 0.5b = - 2 + 0.5 \times ( - 2.4) = \\ = - 2 - 1.2 = - 3.2$