Question

5√7•(-√7) 0,2√72•(-√2) 5√49•(-√7)² 5√81-(-√5)²

Answer 1

Только если так))))))))

Answer 2

1)5*(-7)=-35
2)0.2*(-12)=-2.4
3)5*7*7=245
4)5*9-5=40

Answer 3

Let's simplify each of these expressions step by step:

1. $5√7 • (-√7)$:

   • $5√7 • (-√7) = -5√(7 • 7) = -5√49 = -5 * 7 = -35$

2. $0.2√72 • (-√2)$:

   • First, simplify the square root: $√72 = √(36 * 2) = 6√2$
   • $0.2√72 • (-√2) = 0.2 * 6√2 • (-√2) = 1.2 * (-2) = -2.4$

3. $5√49 • (-√7)²$:

   • $5√49 = 5 * 7 = 35$
   • $(-√7)² = (-√7) • (-√7) = 7$ (because the square of a negative number is positive)
   • $35 • 7 = 245$

4. $5√81 - (-√5)²$:

   • $5√81 = 5 * 9 = 45$
   • $(-√5)² = (-√5) • (-√5) = 5$ (because the square of a negative number is positive)
   • $45 - 5 = 40$

So, the simplified values of the expressions are:

1. $5√7 • (-√7) = -35$
2. $0.2√72 • (-√2) = -2.4$
3. $5√49 • (-√7)² = 245$
4. $5√81 - (-√5)² = 40$