(1+Z)*(X+Y/Z)/(A−1/(1+X*X*X*X)) A2 ; B)ABC; C)B ; D) B

6.

(

1

+

z

)

*

(

x

+

y

/

z

)

/(

a

1

/(

1

+

x

*

x

*

x

*

x

))

a

2

; b)

abc

; c)

b

; d)

b