Page 26 - 新思维数学学生用书8 样章

1.4 Indices

15 Read what Zara says.

I think that
3
5 ( ) = 5 ( ) 2
2
3

a Is Zara correct? Give a reason for your answer.
b Is a similar result true for other indices?

16 15 = 3 × 5
Use this fact to write as a product of prime factors
a 15 2 b 15 3 c 15 5 d 15 8
17 a Write 5 ÷ 5 as a power of 5.
4
6
b Write 5 ÷ as a power of 5.
6
5
6
c Is it possible to write 5 ÷ 5 as a power of 5?
6
4
Summary checklist
I can use index notation for positive integers where the index is a positive

integer or zero.
I can multiply and divide numbers written as powers of a positive integer.

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