Class - VIII

11th

May, 2020

BIOLOGY

Hindi Literature

“अनेक मुखी गंगा” पाठ को �यान पूव�क पढ़े तथा यथा संभव ��� के उ�र

एवम अ!य अ"यास� को कापी म# िलखने का �यास कर#|

English Literature

With Ref. to Chapter 4:- Scrooge and the ghost

Do the following:-

� Read the chapter thoroughly.

� Underline the difficult words in the chapter and find their meanings with

the help of dictionary and also write and learn them.

Physics

* Write keywords

* Write brief and detailed answers in your fair copy.

*Make a project on chapter 1 of just 10 pages.

SUBJECT: MATHEMATICS

LAWS OF EXPONENTS:

1. am× an = a m+n

2. am/an = a m-n

3. (am)n = a m×n

4. am×bm = (a×b)m

5. ��

�� = (

�

�)�

6. ( �

�)� = (

�

�)

7. �� = �

�

8. (�

�)� = �

9. (-a) = � �� � �� ����

−��� � �� ���

10. �°= 1

NOTE: DO THE EXERCISE CH-2 WITH HELP OF THESE

GIVEN SOLVED EXAMPLES:

1. SOLVE FOR �: − �� ÷�

���= 49

�� ÷ �! = 49

��

�!= 49

�" = 49

� = (49)"�

� = {(7)"%1/2

� = 72× ½

� = 7

2. Simplify: [{(-�

")"%�"]��

= { (−1

2)"%" = (−

1

2))

= 1

2)=

1

16

3. If � = (�

!)" × (

!

�)�!. ���� -ℎ� ��/0� �� ��"

� = 5"

3" ×

3�!

5�!

� = 5"

3" ×

5!

3!

� = 5�

3�

∴ � = (5

3 )�

∴ ��" = [(5

3)�]�" = [

5

3]��"

��" = (5

3)��5 = (

3

5)�5

4. Simplify: 6�7 �5�8

"9×��8×"�7

= (2!)�" × (2 × 5)�)

2��:(�") × 5�)

=2�; × 2�) × 5�)

2�< × 5�)=

2��5

2�<

=1

2�