A) 4p (1/2p - 1/3)- 3p (1/6p+1/9)=
=2p^2-4/3p-1/2p^2-1/3p=
=1 1/2p^2-5/3p=1 1/2p^2-1 2/3p
B) -5 (1/4x+1/2y) +3 (3/4-1/2y)=
=-5/4x-5/2y+9/4-3/2y=-1 1/4x- 8/2y+2 1/4=-1 1/4x-4y+2 1/4
C) (1/2m-1/5):2+ (1/2m+2/5): 4=
=1/4m-1/10+1/8m+2/20=2/8m+1/8m-1/10+1/10=3/8m
D) (2/3a+3/4b):6-(1/3a+1/2b) : 4=
=2/18a+3/24b-1/12a+1/8b=
=4/36a-3/36a+1/8b+1/8b=1/36a+2/8b=
1/36a+1/4b
E) 6(1/9u + 1/12)-(1/2u+3/4):3=
=6/9u+6/12-1/6u-3/12=12/18u-3/18u+3/12=9/18u+1/4=1/2u+1/4
