A) P = 2 A A 1 7 A 3   A 3 A 3 ( A 3)( A 3) )AAA2(3A(...

Câu 2: a) P = 2 a a 1 7 a 3

   

a 3 a 3 ( a 3)( a 3)





 

)

a

2

(

3

7

4

6

1

)(

= ( 3 )( 3 )

a

9

=

 

Vậy P = 3 a

a  3 .

b) P < 1  3 a 3 9

1 3 a a 3 a 0 a

 .

2 4

a 3         