Question

помогите, даю 50 боллов​

Answer 1

честно не знаю, но вроде как правильно.

Answer 2

1.  a) 0.2 * 0.2 * 0.2 * 0.2 = 0.2⁴

б) (-cd) * (-cd) * (-cd) = (-cd)³ = -c³d³

2. а) 3*7² - 2*4³ = 3*49 - 2*64 = 147 - 128 = 19

б) (5/6)³ * (-3)³ = (5/6*-3)³ = (-5/2)³ = - 125/8

3. a² - b² = (a - b)(a + b)

(a² - b²)/(a - b) = (a - b)(a + b)/(a - b) = a + b

a = 1.3 b = 0.7  

a + b = 1.3 + 0.7 = 2

4. (10x)² = 900

(10x)² - 30² = 0

(10x - 30)(10x + 30) = 0

10x - 30 = 0   x = 3

10x + 30 = 0  x = -3

или

|10x| = 30

10x = +- 30

x = +- 3