(3 2\3+1 3\4) / (6 7\12+2 1\4)*0,8 =52/265.
1)) 3 2/3+ 1 3/4=
3 (2•4)/(3•4) + 1 (3•3)/(4•3)=
3 8/12+ 1 9/12= 4 17/12= 5 5/12
2)) 6 7/12+ 2 1/4=
6 7/12+ 2 (1•3)/(4•3)=
6 7/12+ 2 3/12= 8 10/12=
Сокращаем 10/12 на 2;
= 8 5/6;
3)) 5 5/12 / 8 5/6 • 0,8=
(5•12+5)/12 : (6•8+5)/6 • 8/10=
65/12 : 53/6• 8/10=
65/12• 6/53• 8/10=
Сокращаем 65 и 10 на 5; 12 и 6 на 6;
13/2• 1/53• 8/5=
Сокращаем 2 и 8 на 2;
13/1• 1/53• 4/5=
(13•4)/(53•5)=
52/265.