5/7+3/14+1/21=? подробно

Question

5/7+3/14+1/21=? подробно

Answer 1

5/7+3/14+1/21= (5/7)*6+(3/14)*3+(1/21)*2=

30/42+9/42+2/42= (30+9+2)/42= 41/42

вот как то так))