一道简便运算2/3+1/6+1/9+1/12+1/15+1/18要简便,步骤（zhou）要清晰

Question

一道简便运算
2/3+1/6+1/9+1/12+1/15+1/18 要简便,步骤（zhou）要清晰

Answer 1

(1/3)(2+1/2+1/3+1/4+1/5+1/6)
=(1/3)(2+1-1/6+1/6+9/20)
=(1/3)(3+9/20)
=(1/3)(69/20)
=23/20