求简便算法算这题：2/3*1/5+2/9（~）2/3*1/5+2/9就求简便算法,

Question

求简便算法算这题：2/3*1/5+2/9（~）
2/3*1/5+2/9 就求简便算法,

Answer 1

2/3*1/5+2/9
=2/3*1/5+2/3*1/3
=2/3*(1/5+1/3)
=2/3*8/15
=16/45