Question

[Tran Thu]

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Answer 1

[Nguyễn Thị Thương Hoài]

Bài 1:

e; \(\dfrac{10}{21}\)  - \(\dfrac{3}{8}\) : \(\dfrac{15}{4}\)

= \(\dfrac{10}{21}\) - \(\dfrac{3}{8}\) x \(\dfrac{4}{15}\)

= \(\dfrac{10}{21}\) - \(\dfrac{1}{10}\)

= \(\dfrac{100}{210}\) - \(\dfrac{21}{210}\)

= \(\dfrac{79}{210}\)

f; (\(\dfrac{2}{3}\) + \(\dfrac{3}{4}\)).(\(\dfrac{5}{7}\) + \(\dfrac{5}{14}\))

=  (\(\dfrac{8}{12}\) + \(\dfrac{9}{12}\)).(\(\dfrac{10}{14}\) + \(\dfrac{5}{14}\))

= \(\dfrac{17}{12}\).\(\dfrac{15}{14}\)

= \(\dfrac{85}{56}\)