Question

помогите плизззззз ​

Answer 1

1.

$\frac{3p - 3}{4} = \frac{3 \times 5- 3}{4} = \frac{15 - 3}{4} = \frac{12}{4} = 3$

2.

$\frac{ - 56x {y}^{3} }{72 {x}^{2} {y}^{2} } = \frac{ - 7y}{9x} = - \frac{7y}{9x}$

3.

$\frac{3x + 7}{2} - \frac{4x + 7}{6} = \frac{3 \times (3x + 7) - (4x + 7)}{6} = \frac{9 + 21 - 4x - 7}{6} = \frac{5x + 14}{6}$

4.

$\frac{ {m}^{2} }{21p} \times \frac{7p}{m {n}^{2} } = \frac{m}{3} \times \frac{1}{ {n}^{2} } = \frac{m}{3 {n}^{2} }$

5.

$\sqrt{0.25 \times 64} = \sqrt{16} = 4$

6.

${x}^{2} - 7 = 16 \\ {x}^{2} = 16 + 7 \\ {x}^{2} = 23 \\ \times = + - \sqrt{23}$

7.

$\sqrt{3} \\ 0.7 \\ \sqrt{0.25}$

9.

$6 {x}^{2} + 4x - 2 = 0 \\ d = {4}^{2} - 4 \times 6 \times ( - 2) = 16 + 48 = 64 = {8}^{2} \\ x1 = \frac{ - 4 + 8}{2 \times 6} = \frac{2}{12} = \frac{1}{6} \\ x2 = \frac{ - 4 - 8}{2 \times 6} = \frac{ - 12}{12} = - 1$

Ответ: 1/6