Question

please help me at this questions.

Answer 1

3/7-1/14+1/21
10/21-1/14
 (20-3)/42
17/42

Answer 2

Hey Pal!

Please don't mind but your question's attachment is looking a bit illegible.... but I think your question is to simplify : 3/7 - 1/14 + 1/21

I hope this is your question... 

Solution:

3/7 - 1/14 + 1/21
⇒3×6 - 1×3 + 1×2/42
⇒18 - 3 + 2 / 42
⇒17/42 

Hope this is what you asked for... 

Hope helped!