Question

помагите срочно алгебра 8 класс 3.9 номер
1) 2) сдклал в школе ​

Answer 1

Ответ:

1.

$\sqrt{63} \times \sqrt{28} = \sqrt{63 \times 28} = \sqrt{7 \times 9 \times 7 \times 4} = \sqrt{49} \times \sqrt{9} \times \sqrt{4} = 7 \times 3 \times 2 = 42$

2.

$\frac{ \sqrt{6} }{ \sqrt{24} } = \sqrt{ \frac{6}{24} } = \sqrt{ \frac{1}{4} } = \frac{1}{2} = 0.5$

3.

$\sqrt{0.5} \times \sqrt{0.32} = \sqrt{0.5 \times 0.32} = \sqrt{0.16} = 0.4$

4.

$\sqrt{ \frac{5}{7} } \times \sqrt{ \frac{63}{125} } = \sqrt{ \frac{5 \times 63}{7 \times 125} } = \sqrt{ \frac{1 \times 9}{1 \times 25} } = \sqrt{ \frac{9}{25} } = \frac{3}{5} = 0.6$

5.

$\sqrt{3 \frac{1}{5} } \times \sqrt{0.2} = \sqrt{3.2} \times \sqrt{0.2} = \sqrt{3.2 \times 0.2} = \sqrt{0.64} = 0.8$

6.

$\sqrt{ \frac{15}{135} } = \sqrt{ \frac{1}{9} } = \frac{1}{3}$