Question

прошу помогите, отдаю последние балы​

Answer 1

Объяснение:

3)

$a) \sqrt{64} \times \sqrt{25} = 8 \times 5 = 40 \\ b) \frac{ \sqrt{49} }{ \sqrt{81} } = \frac{7}{9} \\ в) \frac{ \sqrt{4} }{ \sqrt{9} } \times \frac{ \sqrt{25} }{ \sqrt{49} } = \frac{2}{3} \times \frac{5}{7} = \frac{10}{21}$

4)

$a) \sqrt{27} \times \sqrt{3} = \sqrt{3 \times 3 \times 3 \times 3} = 3 \times 3 = 9$

$b) \frac{ \sqrt{108} }{ \sqrt{3} } = \sqrt{ \frac{36 \times 3}{3} } = \sqrt{36} = 6$

5)

$a)4 \sqrt{3} = \sqrt{16 \times 3} = 48 \\ b)2 \sqrt{5} = \sqrt{4 \times 5} = \sqrt{20} \\ в)x \sqrt{y} = - \sqrt{x {}^{2}y }$

6)

$a) \sqrt{50} = \sqrt{25 \times 2} = \sqrt{5 \times 5 \times 2} = 5 \sqrt{2} \\ b) \frac{1}{2} \sqrt{48} = \frac{1}{2} \sqrt{16 \times 3} = \frac{1}{2} \times 4 \sqrt{3} = 2 \sqrt{3} \\ в) - 0.2 \sqrt{75} = - 0.2 \sqrt{25 \times 3} = - 0.2 \times 5 \sqrt{3} = - \sqrt{3}$