Question

4) 9а * (-0,3); 5) -3,4а * 2б; 6) -4 1/6а * 0,6б; 7) -5,2х * (-4) 8) -4х * 0,8 у; 9) -1 2/7 х * (- 1/3 y)

Answer 1

Ответ:

Смотри решение на фото

Answer 2

To simplify these expressions, you can perform the multiplications as follows:

4. 9a * (-0.3) = -2.7a

5. -3.4a * 2b = -6.8ab

6. -4 1/6a * 0.6b = -(4 + 1/6) * 0.6ab = -4 * 0.6ab - (1/6) * 0.6ab = -2.4ab - 0.1ab = -2.5ab

7. -5.2x * (-4) = 20.8x

8. -4x * 0.8y = -3.2xy

9. -1 2/7x * (-1/3y) = (-1 + 2/7) * (1/3)y = (-7/7 + 2/7) * (1/3)y = (-5/7) * (1/3)y = (-5/21)xy

So, the simplified expressions are:

4. -2.7a
5. -6.8ab
6. -2.5ab
7. 20.8x
8. -3.2xy
9. (-5/21)xy