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

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