introduction of ch 5 maths 7

5:24

2:40

4:01

2:14

9:37

4:36

9:23

8:13

18:18

11:13

28:38

8:12

15:39

4:45

6:08

11:00

5:35

6:33

کوتاه

8:22

10:52

5:31

2:11

7:14

53:59

3:48

5:01

12:42

2:22

34:59

8:03

28:36

7:42

3:45

3:45

1:06

14:53

2:17

6:18

14:19