Завдання:
Знайди значення виразу:
1) –5 ⋅ (4,7 – 4,9);
2) (–0,4 – 0,8) ⋅ 1,5;
3) (2,7 – 2,9) ⋅ (–4,5) – 3,02;
4) –2,8 ⋅ 5 – 4 ⋅ (–0,7).
Розв'язок:
1) -5 ⋅ (4,7 – 4,9) = -5 ⋅ (-0,2) = 1
2) (-0,4 – 0,8) ⋅ 1,5 = -1,2 ⋅ 1,5 = -1,8
3) (2,7 – 2,9) ⋅ (-4,5) – 3,02 = -0,2 ⋅ (-4,5) – 3,02 = 0,9 – 3,02 = -2,12
4) -2,8 ⋅ 5 – 4 ⋅ (-0,7) = -14 – (-2,8) = 2,8 – 14 = -11,2