Question

3 * √ 64\81 = ? (дробь и квадратный корень) (решить, можно с помощью корня, можно без) 10√3,24 - √256

Answer 1

1)3 * √ 64\81 = 3*8/9=8/3=
2)

x^2=0,49

x=-0,7

x=0,7 

3)

x^2=-3      - не имеет смысла
4)

x^2=-1     - не имеет смысла
5)10√3,24 - √256=10*1,8  - 16=18-16=2

Answer 2

I can help you with math problems. Here is the solution to your question:

$$3 \times \sqrt{\frac{64}{81}} = ? \quad (\text{дробь и квадратный корень})$$

To solve this, we can simplify the fraction under the square root and then apply the property of square roots:

$$\sqrt{\frac{64}{81}} = \sqrt{\frac{16 \times 4}{9 \times 9}} = \sqrt{\frac{16}{9} \times \frac{4}{9}} = \sqrt{\frac{16}{9}} \times \sqrt{\frac{4}{9}} = \frac{4}{3} \times \frac{2}{3} = \frac{8}{9}$$

Therefore,

$$3 \times \sqrt{\frac{64}{81}} = 3 \times \frac{8}{9} = \frac{24}{9} = \frac{8}{3}$$

The answer is $\frac{8}{3}$.

$$10 \sqrt{3.24} - \sqrt{256} = ?$$

To solve this, we can rewrite the numbers under the square roots as perfect squares and then apply the property of square roots:

$$\sqrt{3.24} = \sqrt{1.8^2} = 1.8$$

$$\sqrt{256} = \sqrt{16^2} = 16$$

Therefore,

$$10 \sqrt{3.24} - \sqrt{256} = 10 \times 1.8 - 16 = 18 - 16 = 2$$

The answer is $2$.