Question

Answer 1

√9/5.1/2+3/5.5/2+3/5.13/4
=3/5.1/2+3/5.5/2+3/5.13/4
=3/5.(1/2+5/2+13/4)
=3/5.25/4
=15/4

Answer 2

b/ đề ....
=\(\dfrac{3}{5}.\dfrac{1}{2}+\dfrac{3}{5}.\dfrac{5}{2}+\dfrac{3}{5}.\dfrac{13}{4}\)
=\(\dfrac{3}{10}+\dfrac{3}{2}+\dfrac{39}{20}\)
=\(\dfrac{6}{20}+\dfrac{30}{20}+\dfrac{39}{20}\)
=\(\dfrac{15}{4}\)