Q 2 3 2.3 2.4 2 4 ( 2 3 4) 2( 2 3 4) 1 2= = = ++ + + + .2 3 4 2 3...

77.

Q

2

3

2.3

2.4 2 4

(

2

3

4

)

2

(

2

3

4

)

1

2

=

=

= +

+

+

+

+

.

2

3

4

2

3

4