Question

2/7 + 1/5 + 5/7 + 4/5

tính bằng cách thuận tiện nhất

 

Answer 1

= 2/7+5/7+1/5+4/5

=7/7+5/5

=1+1

=2

Answer 2

( 2/7 + 5/7 ) + ( 1/5 + 4/5 )

= 1 + 1

= 2

Answer 3

= (2/7+5/7)+(1/5+4/5)

=1+1=2

Answer 4

\(\dfrac{2}{7}+\dfrac{1}{5}+\dfrac{5}{7}+\dfrac{4}{5}=\left(\dfrac{2}{7}+\dfrac{5}{7}\right)+\left(\dfrac{1}{5}+\dfrac{4}{5}\right)=1+1=2\)

Answer 5

\(\dfrac{2}{7}+\dfrac{1}{5}+\dfrac{5}{7}+\dfrac{4}{5}=\left(\dfrac{2}{7}+\dfrac{5}{7}\right)+\left(\dfrac{1}{5}+\dfrac{4}{5}\right)=1+1=2\)

Answer 6

\(\dfrac{2}{7}+\dfrac{1}{5}+\dfrac{5}{7}+\dfrac{4}{5}\)

= \(\left(\dfrac{2}{7}+\dfrac{5}{7}\right)+\left(\dfrac{1}{5}+\dfrac{4}{5}\right)\)

= \(\dfrac{7}{7}+\dfrac{5}{5}\)

= \(1+1=2\)

Answer 7

2/7 + 1/5 + 5/7 + 4/5

= 7/7 + 5/5

= 1+1

= 2

Answer 8

= 2/7+5/7+1/5+4/5

=7/7+5/5

=1+1

=2

Answer 9

kết quả là 2

Answer 10

2

Answer 11

2