(1/8+2/9-1/4)*51/7:(7/9-2/3+1/6) =
1)) 1/8+ 2/9= (1•9)/(8•9)+ (2•8)/(9•8)=
9/72+ 16/72= 25/72
2)) 25/72- 1/4= 25/72- (1•18)/(4•18)=
25/72- 18/72= 7/72
3)) 7/9- 2/3= 7/9- (2•3)/(3•3)=
7/9- 6/9= 1/9
4)) 1/9+ 1/6= (1•2)/(9•2)+ (1•3)/(6•3)=
2/18+ 3/18= 5/18
5)) 7/72 • 51/7=
Сокращаем 7 и 7 на 7; 51 и 72 на 3;
1/24• 17/1= 17/24
6)) 17/24: 5/18= 17/24• 18/5=
Сокращаем 24 и 18 на 3
17/8• 6/5= 102/40= 2 24/40
Сокращаем 24 и 40 на 8
= 2 3/5