Question

2/3 + 2/15 + 2/35 + 2/63 

Answer 1

mả cha mày

Answer 2

2/3 + 2/15 + 2/35 + 2/63

= 2/1×3 + 2/3×5 + 2/5×7 + 2/7×9

= 1 - 1/3 + 1/3 - 1/5 + 1/5 - 1/7 + 1/7 - 1/9

= 1 - 1/9

= 8/9

Answer 3

\(\frac{2}{3}+\frac{2}{15}+\frac{2}{35}+\frac{2}{63}\)

= \(\frac{4}{5}+\frac{4}{45}\)

= \(\frac{8}{9}\)