Question

Tính bằng cách thuận tiện nhất 

7/8 x 1/4 + 7/8 x 2/4 + 7/8 

Answer 1

7/8 x 1/4 + 7/8 x 2/4 + 7/8

=7/8 x\(\left(\dfrac{1}{4}+\dfrac{2}{4}\right)\) + 7/8

=7/8 x 3/4 + 7/8

=7/8 x \(\left(\dfrac{3}{4}+1\right)\)

=7/8 x 7/4

=49/32

Answer 2

`7/8 xx 1/4 + 7/8 xx 2/4 + 7/8`

`= 7/8 xx 1/4 + 7/8 xx 2/4 + 7/8xx1`

`= 7/8 xx (1/4 +2/4+1)`

`= 7/8 xx ( 3/4 + 4/4)`

`= 7/8 xx 7/4`

`= 49/32`

` @ nkhanh`

Answer 3

7/8 x 1/4 + 7/8 x 2/4 + 7/8

=7/8 x 1/4 + 7/8 x 2/4 + 7/8 x 4/4

= 7/8x(1/4+2/4+4/4)

=7/8x7/4

=49/32

Answer 4

\(\dfrac{7}{8}\) \(\times\) \(\dfrac{1}{4}\) + \(\dfrac{7}{8}\) \(\times\) \(\dfrac{2}{4}\) +  \(\dfrac{7}{8}\)

\(\dfrac{7}{8}\) \(\times\) \(\dfrac{1}{4}\) + \(\dfrac{7}{8}\) \(\times\) \(\dfrac{2}{4}\) + \(\dfrac{7}{8}\) \(\times\)1

= \(\dfrac{7}{8}\) \(\times\) ( \(\dfrac{1}{4}\) + \(\dfrac{2}{4}\) + 1)

= \(\dfrac{7}{8}\) \(\times\) (\(\dfrac{3}{4}\) + 1)

= \(\dfrac{7}{8}\) \(\times\) \(\dfrac{7}{4}\)
= \(\dfrac{49}{32}\)