Question

Помогите пожалуйста!
40 баллов!!

Answer 1

1)

$\sqrt{128} + \sqrt{32} + \sqrt{98} = 8 \sqrt{2} + 4 \sqrt{2} + 7 \sqrt{2} = \sqrt{2} (8 + 4 + 7) = 19 \sqrt{2}$

2)

$3 \sqrt{b} + 4 \sqrt{b} - 8 \sqrt{b} = \sqrt{b} (3 + 4 - 8) = - 1 \sqrt{b} = - \sqrt{b}$

3)

$5 \sqrt{c} + 7 \sqrt{a} - 4 \sqrt{c} = \sqrt{c} (5 - 4) + 7 \sqrt{a} = \sqrt{c} + 7 \sqrt{a}$

4)

$(6 \sqrt{12} - \sqrt{75} ) \sqrt{3} = (12 \sqrt{3} - 5 \sqrt{3} ) \sqrt{3} = \sqrt{3} (12 - 5) \times \sqrt{3} = 3 \times 7 = 21$

5)

$( \sqrt{m} - 2\sqrt{n} )( \sqrt{m} - \sqrt{n} ) = m - \sqrt{mn} - 2 \sqrt{mn} + 2n = m - 3 \sqrt{mn} + 2n$