Question

Tính bằng cách thuận tiện :

4/5 x 3/7 + 4/5 x 6/7 - 4/5 x 4/14

Answer 1

= 4/5 x ( 3/7 + 6/7 - 4/14 )

= 4/5 x ( 3/7 + 6/7 - 2/7 )

= 4/5 x 7/7

= 4/5

Answer 2

4/5 x 3/7 + 4/5 x 6/7 - 4/5 x 4/14

= 4/5 x ( 3/7 + 6/7 - 4/14)

= 4/5 x 1

= 4/5

Answer 3

4/5

Answer 4

=4/5x3/7+6/7-4/14

=4/5x(3/7+6/7-2/7)

=4/5x1=4/5

Answer 5

= ( 3/7 + 6/7 - 4/14) × 4/5

= 1 × 4/5 

= 4/5 => 0,8

Answer 6

4/5 x 3/7 + 4/5 x 6/7 - 4/5 x 4/14

= 4/5x (3/7+ 6/7- 4/14)

= 4/5 x 7/7 (bn có thể dùng 1 để dễ tính hơn nhé)

= 4/5

Answer 7

4/5 . 3/7 + 4/5 . 6/7 - 4/5 . 4/14

4/5 . ( 3/7 + 6/7 - 4/14)

4/5 . 1

4/5

Answer 8

\(\dfrac{4}{5}.\dfrac{3}{7}+\dfrac{4}{5}.\dfrac{6}{7}-\dfrac{4}{5}.\dfrac{4}{14}\)

\(=\dfrac{4}{5}.\left(\dfrac{3}{7}+\dfrac{6}{7}-\dfrac{4}{14}\right)\)

\(=\dfrac{4}{5}.\left(\dfrac{3}{7}+\dfrac{6}{7}-\dfrac{2}{7}\right)\)

\(=\dfrac{4}{5}.\left(\dfrac{9}{7}-\dfrac{2}{7}\right)\)

\(=\dfrac{4}{5}.\dfrac{7}{7}\)

\(=\dfrac{4}{5}\)

Lưu ý: Dấu "." là dấu "x" nhé! Hihi.