1)) {2/3+1/6}/3= { (2•2)/(3•2)+ 1/6}/3=
{4/6+1/6}/3= {5/6}/3= 5/6 :3=
5/6• 1/3= 5/18.
2)) {17/100- 1/10}/ 10=
{17/100- (1•10)/(10•10)}/10=
{17/100- 10/100}/10=
{7/100}/10= 7/100: 10=
7/100• 1/10= 7/1000.
Тут в десятичных удобно
{17/100- 1/10}/ 10= {0,17- 0,1}/10=
{0,07}/10= 0,07: 10=
0,07• 1/10= 0,07•0,1= 0,007.
3)) {1- 1/6}/{2+1/6}=
{6/6-1/6}/{(2•6)/6+ 1/6}=
{5/6}/{12/6+ 1/6}=
5/6 /{13/6}= 5/6: 13/6= 5/6• 6/13=
Сокращаем 6 и 6 на 6;
5/1• 1/13= 5/13.