Завдання:
Знайди значення виразу:
1) –2 ⋅ (–4,2 + 5,9);
2) (–0,42 – 0,15) ⋅ 6,2;
3) (4,7 – 9,6) ⋅ (–3,1) – 4,09;
4) 4,02 ⋅ (–3,5) – (–0,5) ⋅ (–0,4).
Розв'язок:
1) -2 ⋅ (-4,2 + 5,9) = -2 ⋅ 1,7 = 3,4
2) (-0,42 – 0,15) ⋅ 6,2 = -0,57 ⋅ 6,2 = -3,534
3) (4,7 – 9,6) ⋅ (-3,1) – 4,09 = -4,9 ⋅ (-3,1) – 4,09 = 15,19 – 4,09 = 11,1
4) 4,02 ⋅ (-3,5) – (-0,5) ⋅ (-0,4) = -14,07 – 0,2 = -14,27