Question

Пользуясь сочетательное свойства, Вычислите наиболее удобным способом

Answer 1

1.
(3 * (-2)) * 5 = -3 * 2 * 5 = -3 * 10 = -30,

2.
(-9 * 4) * (-2,5) = 9 * 4 * 2,5 = 9 * 10 = 90,

3.
(3 * (-5)) * 20 = -3 * 5 * 20 = -3 * 100 = -300,

4.
(-9 * 15) * (-2) = 9 * 15 * 2 = 9 * 30 = 270,

5.
(-8 * (-12)) * 5 = 8 * 12 * 5 = 8 * 60 = 480,

6.
(3 * (-25)) * 2 = -3 * 25 * 2 = -3 * 50 = -150