Завдання:
Знайди значення виразу найзручнішим способом:
1) 314 ⋅ 66 + 314 ⋅ 34;
2) 43 ⋅ 59 + 69 ⋅ 43 – 28 ⋅ 43;
3) 942 ⋅ 175 – 174 ⋅ 942;
4) 114 ⋅ 197 – 114 ⋅ 96 – 114.
Розв'язок:
1) 314 ⋅ 66 + 314 ⋅ 34 = 314 • (66 + 34) = 314 • 100 = 31 400
2) 43 ⋅ 59 + 69 ⋅ 43 – 28 ⋅ 43 = 942 • (175 - 174) = 942 • 1= 942
3) 942 ⋅ 175 – 174 ⋅ 942 = 43 • (59 + 69 - 28) = 43 • 100 = 4300
4) 114 ⋅ 197 – 114 ⋅ 96 – 114 = 114 • (197 - 96 - 1) = 114 • 100 = 11 400