Question

Thực hiện phép tính

-3/4 . (-55/9) . 8/11

1 4/23 + ( 5/21 - 4/23) + 16/21 - 1/2

-3/8 . 6/13 + 7/13 . -3/8 + 1 3/8

75% - ( 5/2 + 5/3 ) + ( - 1/2) mũ 2

Giúp mình với đi please

Answer 1

- \(\dfrac{3}{4}\).(-\(\dfrac{55}{9}\)).\(\dfrac{8}{11}\)

= \(\dfrac{3.5.11.4.2}{4.3.3.11}\)

= \(\dfrac{10}{3}\)

Answer 2

   1\(\dfrac{4}{23}\) + (\(\dfrac{5}{21}\) - \(\dfrac{4}{23}\)) + \(\dfrac{16}{21}\) - \(\dfrac{1}{2}\)

= 1 + \(\dfrac{4}{23}\) + \(\dfrac{5}{21}\) - \(\dfrac{4}{23}\) + \(\dfrac{16}{21}\) - \(\dfrac{1}{2}\)

= 1 + (\(\dfrac{4}{23}\) - \(\dfrac{4}{23}\)) + (\(\dfrac{5}{21}\) + \(\dfrac{16}{21}\)) - \(\dfrac{1}{2}\)

= 1 + 0 + 1 - \(\dfrac{1}{2}\)

= 2  - \(\dfrac{1}{2}\)

= \(\dfrac{3}{2}\)

Answer 3

- \(\dfrac{3}{8}\).\(\dfrac{6}{13}\) + \(\dfrac{7}{13}\). (-\(\dfrac{3}{8}\)) + 1\(\dfrac{3}{8}\)

= -\(\dfrac{3}{8}\).(\(\dfrac{6}{13}\) + \(\dfrac{7}{13}\)) + 1 + \(\dfrac{3}{8}\)

= - \(\dfrac{3}{8}\) + 1 + \(\dfrac{3}{8}\)

= (-\(\dfrac{3}{8}\) + \(\dfrac{3}{8}\)) + 1

= 0 + 1

= 1

Answer 4

75% - (\(\dfrac{5}{2}\) + \(\dfrac{5}{3}\)) + (\(-\dfrac{1}{2}\))²

= \(\dfrac{3}{4}\) - \(\dfrac{25}{6}\) + \(\dfrac{1}{4}\)

= (\(\dfrac{3}{4}\) + \(\dfrac{1}{4}\)) - \(\dfrac{25}{6}\)

= 1 - \(\dfrac{25}{6}\)

= - \(\dfrac{19}{6}\)