Question

[Ran Mori]

\(\frac{4}{3.6}\)+ \(\frac{4}{6.9}\)+ \(\frac{4}{9.12}\)+\(\frac{4}{12.15}\)

= 4(\(\frac{1}{3.6}\)+\(\frac{1}{6.9}\)+\(\frac{1}{9.12}\)+\(\frac{1}{12.15}\))

=\(\frac{4}{3}\)( \(\frac{1}{3}-\frac{1}{6}+\frac{1}{6}-\frac{1}{9}+\frac{1}{9}-\frac{1}{12}+\frac{1}{12}-\frac{1}{15}\) )

=\(\frac{4}{3}\)(\(\frac{1}{3}-\frac{1}{15}\))

=\(\frac{4}{3}\).\(\frac{4}{15}\)

=\(\frac{16}{45}\)

mk làm đúng chưa

Answer 1

[Sherlockichi Kudoyle]

đúng rồi đó

Answer 2

[HKT_Bí Mật]

rồi,kp nha