Номер 1271
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