Question

Como posso desenvolver os cálculos das expressões: 
1/2 x (1/5 + 1/2 x 1/3) - 1/5 x (1/6 + 1/2 . 1/5)

3/2 + (1 + 1/2) x (2 + 1 1/3) x (3 + 1/4)

Answer 1

1/2X(1/5+1/6)-1/5X(1/6+1/10)=
1/2X(6/30+5/30)-1/5X(5/30+3/30)=
1/2X11/30 - 1/5X8/30=
11/60-8/150=
11/60-4/75=
825/4500-240/4500=
585/4500=
117/900=
39/300=
13/100

3/2+(2/2+1/2) X (6/3+1/3)X(12/4+1/4)=
3/2+3/2 X 7/3 X 13/4=
6/2X7/3X13/4=
3X7/3X13/4=
91/4