Завдання:
Виконай множення зручним способом:
1) –0,5 ⋅ 29 ⋅ (–2);
2) 4 ⋅ (–13) ⋅ (–0,5);
3) –0,4 ⋅ (–119) ⋅ 5;
4) 1,25 ⋅ (–4,8) ⋅ (–8);
5) –37,2 ⋅ 50 ⋅ (–2);
6) 13 ⋅ (–4) ⋅ (–7) ⋅ (–25).
Розв'язок:
1) -0,5 ⋅ 29 ⋅ (-2) = (-0,5 ⋅ (-2)) ⋅ 29 = 1 ⋅ 29 = 29
2) 4 ⋅ (-13) ⋅ (-0,5) = (4 ⋅ (-0,5)) ⋅ (-13) = -2 ⋅ (-13) = 26
3) -0,4 ⋅ (-119) ⋅ 5 = (-0,4 ⋅ 5) ⋅ (-119) = -2 ⋅ (-119) = 238
4) 1,25 ⋅ (-4,8) ⋅ (-8) = (1,25 ⋅ (-8)) ⋅ (-4,8) = -10 ⋅ (-4,8) = 48
5) -37,2 ⋅ 50 ⋅ (-2) = -37,2 ⋅ (50 ⋅ (-2)) = -37,2 ⋅ (-100) = 3720
6) 13 ⋅ (-4) ⋅ (-7) ⋅ (-25) = (-4 ⋅ (-25)) ⋅ (13 ⋅ (-7)) = 100 ⋅ (-91) = -9100