คณิตศาสตร์

การบ้าน

1. 5+2  = ......................

2. 5-2  = ......................

3. 5+12  = ......................

4. 5+22  = ......................

6. 5+32  = ......................

7. 15+32  = ......................

8. 25+62  = ......................

9. 55+28  = ......................

10. 56+21  = ......................