Завдання:
Спрости вираз і запиши окремо його коефіцієнт:
1) –5m ⋅ 9;
2) –2x ⋅ (–0,8);
3) 4,5a ⋅ (–4b);
4) 7,2 ⋅ (–2b) ⋅ (–1);
5) –0,4m ⋅ 2,5;
6) –12a ⋅ (–1/12b).
Розв'язок:
1) -5m ⋅ 9 = -45m; (-45)
2) -2x ⋅ (-0,8) = 1,6x; (1,6)
3) 4,5a ⋅ (-4b) = -18ab; (-18)
4) 7,2 ⋅ (-2b) ⋅ (-1) = 14,4b; (14,4)
5) -0,4m ⋅ 2,5 = -m; (-1)
6) -12a ⋅ (-b/12) = ab; (1)