Завдання 1201 - 1300 » 1271

Розкрий дужки та обчисли: 1) (1/8 – 1/2) · 8 = 1/8 · 8 – 1/2 · 8 = 1 – 4 = –3; 2) –15 · (1/3 – 1/5) = –15 · 1/3 – 15 · (–1/5) = – 5 + 3 = –2; 3) 9 · (1/9 – 1/3 + 1) = 9 · 1/9 – 9 · 1/3 + 9 · 1 = 1 – 3 + 9 = 7; 4) (–1/17 + 1/34) · 34 = – 1/17 · 34 + 1/34 · 34 = – 2 + 1 = – 1; 5) (1/20 + 1/10 – 1/5) · (–20) = 1/20 · (–20) + 1/(10 ) · (–20) – 1/5 · (–20) = –1 – 2 + 4 = 1; 6) 15 · (–1/3 – 1/5 – 1/15) = 15 · (–1/3) + 15 · (–1/5) + 15 · (–1/15) = –5 – 3 – 1 = –9.