ГДЗ Алгебра 7 клас О.С. Істер (2024)

29. Обчисліть:

1) 4\5/9  + 11\3/15 = 20/45 + 33/45 = 53/45 = 18/45;

2) 9\3/16 - 5\4/12 = 27/48 - 20/48 = 7/48;

3) 21/5 + 1/10 = 11\2/5 + 1/10 = 22/10 + 1/10 =

= 23/10 = 23/10;

4) 74/9 - 1/3 = 67/9 - 1\3/3 = 67/9 - 3/9 = 

= 64/9 = 71/9;

5) 4/9 • 7/16 = 1/9 • 7/4 = 7/36;

6) 12/13 • 39/40 = 12/1 • 3/40 = 36/40 = 9/10;

7) 7/10 : 2/5 = 7/10 • 5/2 = 7/2 • 1/2 =

= 7/4 = 13/4;

8) 5/8 : 15/16 = 5/8 • 16/15 = 2/3.