Question

tính bằng cách thuận tiện nhất

9/10+7/5-7/10-6/5

Answer 1

\(=\left(\dfrac{9}{10}-\dfrac{7}{10}\right)+\left(\dfrac{7}{5}-\dfrac{6}{5}\right)=\dfrac{1}{5}+\dfrac{1}{5}=\dfrac{2}{5}\)

Answer 2

9/10+7/5-7/10-6/5

=( 9/10 - 7/10 ) + ( 7/5 - 6/5)

=1/5 + 1/5

=2/5

Answer 3

( 9/10 - 7/10 ) + ( 7/5 - 6/5 )

= 1/5 + 1/5

= 2/5

Answer 4

9/10+7/5-7/10-6/5

=( 9/10 - 7/10 ) + ( 7/5 - 6/5)

=1/5 + 1/5

=2/5