Question

[Nguyễn Bình Phương Nghi]

1/2.6/7+5/7.5-8/9 

Bằng bao nhiêu vậy mn? 

Answer 1

[Nguyễn Thị Thương Hoài]

\(\dfrac{1}{2}\) \(\times\) \(\dfrac{6}{7}\) + \(\dfrac{5}{7\times5}\) - \(\dfrac{8}{9}\)

= \(\dfrac{3}{7}\) + \(\dfrac{1}{7}\) - \(\dfrac{8}{9}\)

= \(\dfrac{4}{7}\) - \(\dfrac{8}{9}\)

= - \(\dfrac{20}{63}\)

Answer 2

[Đinh Trung Hiếu]

\(\dfrac{20}{63}\)