Question

Помогите паже
1 ) 4/15 + 7/12 ;2) 11/48 - 5/36 ;3) 79/20 - 5 17/30 ;4)9 8/21 +4 11/14

Answer 1

Ответ:

Пошаговое объяснение:

1 ) 4/15 + 7/12 =>  НОК(15;12) = 60 =>16/60+35/60 = 51/60 = 17/20;

2) 11/48 - 5/36 =>  НОК(48;36) = 144 => 33/144 - 20/144 = 13/144;

3) 7  9/20-5 17/30=>НОК(20;30)=60=>7 27/60 - 5 34/60 = 2 (27-34)/60 =

= 1 (60+27-34)/60 = 1 (87-34)/60 = 1 53/60;

4)  9 8/21 +4 11/14 = НОК(21;14)=42 =>9 16/42 + 4 33/42 =

= 13 49/42 = 14 7/42 =  14 1/6.