Номер 1247
Знайди значення виразу:
1) –6,8 • 1/9 • (–1/4) • (–2,7) = –6 8/10 • 1/9 • (–1/4) • (–2 7/10) = (–6 4/5 • (–1/4)) • (1/9 • (–2 7/10)) = (–34/5 • (–1/4)) • (1/9 • (–27/10)) = 17/10 • (–3/10) = –51/100 = –0,51
2) –2 2/3 • (–0,4) • 0,75 • 1 3/4 = –2 2/3 • (–4/10) • 75/100 • 1 3/4 = –8/3 • (–2/5) • 3/4 • 7/4 = (–8/3 • 3/4) • (–2/5) • 7/4 = –2 • (–7/10) = 14/10 = 1,4
3) 0,375 • (–1 5/7) • 4/9 • 2 1/3 = 375/1000 • (–1 5/7) • 4/9 • 2 1/3 = 3/8 • (–12/7) • 4/9 • 7/3 = (3/8 • 4/9) • ((–12/7) • 7/3) = 1/6 • (–4) = –4/6 = –2/3
4) –1 2/11 • (–18 1/3) • (–1,8) • (–12/13) = –13/11 • (–55/3) • (–9/5) • (–12/13) = (–13/11 • (–12/13)) • ((–55/3) • (–9/5)) = 12/11 • 33 = 36