Номер 1237

1) 5/9 • (–2,5) • (–1 4/5) • 0,8 = (5/9 • (–9/5)) • ((–2,5) • 0,8) = –1 • (–2) = 2

2) 7/8 • (–2/23) • 1 1/4 • (–46) = (7/8 • 5/4) • (–2/23 • (–46)) = 35/32 • 4 = 140/32 = 4 12/32 = 4 3/8

3) –6,5 • 6/13 • (–2) • (–2 1/6) = (–6,5 • (–2)) • (6/13 • (–13/6)) = 13 • (–1) = –13

4) –7/18 • (–39) • (–4/13) • 9/14 = (–7/18 • 9/14) • (–39 • (–4/13)) = –1/4 • 12 = –3

5) –4/9 • (–7/22) • 2 1/4 • (–1 4/7) = (–4/9 • 9/4)(–7/22 • (–11/7)) = –1 • 11/22 = –1 • 1/2 = –1/2

6) 5/12 • (–8/9) • (–1 1/8) • 4/15 = (5/12 • 4/15)(–8/9 ∙(–9/8)) = 1/9 • 1 = 1/9