Question

дроби, 5 класс
(13/15 - 3/5) + (17/30 - 1/10) =
(5/9 + 2/3) - (11/18 + 1/6) =
(5/7 - 3/14) - (25/28 - 9/14) =

Answer 1

Ответ:

(13/15-3/5)+(17/30-1/10)=(13/15-9/15)+(17/30-3/30)=4/15+14/30=8/30+14/30=22/30=11/15

(5/9+2/3)-(11/18+1/6)=(5/9+6/9)-(11/18+3/18)=11/9-14/18=22/18-14/18=8/18

(5/7-3/14)-(25/28-9/14)=(10/14-3/14)-(25/28-18/28)=7/14-7/28=14/28-7/28=7/28