Question

[Huyen truong thanh]

tính bằng cách thuận tiện nhất: 9/5 : 7/6 + 3/2 : 7/6 - 8/5 x 6/7

Answer 1

[Nguyễn Minh Dương]

\(\dfrac{9}{5}:\dfrac{7}{6}+\dfrac{3}{2}:\dfrac{7}{6}-\dfrac{8}{5}\times\dfrac{6}{7}\\ =\dfrac{9}{5}\times\dfrac{6}{7}+\dfrac{3}{2}\times\dfrac{6}{7}-\dfrac{8}{5}\times\dfrac{6}{7}\\ =\dfrac{6}{7}\times\left(\dfrac{9}{5}+\dfrac{3}{2}-\dfrac{8}{5}\right)\\ =\dfrac{6}{7}\times\dfrac{17}{10}\\ =\dfrac{51}{35}.\)

Answer 2

[Nguyễn Thị Thương Hoài]

\(\dfrac{9}{5}\) : \(\dfrac{7}{6}\) + \(\dfrac{3}{2}\) : \(\dfrac{7}{6}\) - \(\dfrac{8}{5}\) x \(\dfrac{6}{7}\)

= \(\dfrac{9}{5}\times\dfrac{6}{7}+\dfrac{3}{2}\times\dfrac{6}{7}\) - \(\dfrac{8}{5}\times\dfrac{6}{7}\)

= \(\dfrac{6}{7}\times\) (\(\dfrac{9}{5}\) + \(\dfrac{3}{2}\) - \(\dfrac{8}{5}\))

= \(\dfrac{6}{7}\) x (\(\dfrac{9}{5}\) - \(\dfrac{8}{5}+\dfrac{3}{2}\))

=  \(\dfrac{6}{7}\) x (\(\dfrac{1}{5}\) + \(\dfrac{3}{2}\))

 = \(\dfrac{6}{7}\) x \(\dfrac{17}{10}\)

= \(\dfrac{51}{35}\)