1) 3 2/20-Х=18 1/8
Х=3 2/20-18 1/8
Х=3 2/20+(-18 1/8)
Х= -15 1/40
2)-10 3/7- Х= -9 2/3
Х= -10 3/7 - (-9 2/3)
Х= -10 3/7+ 9 2/3
Х=10 3/7- 9 2/3
НОК(7;3)=21 Х= 10 9/21- 9 14/21
Х=9 30/21-9 14/21
Х= -16/21
3) 3 1/2-Х=7 1/5
Х=3 1/2- 7 1/5
Х= 3 1/2+(-7 1/5)
Х= 7 1/5- 3 1/2
НОК(5;2)=10 Х=7 2/10- 3 5/10
Х=6 12/10- 3 5/10
Х= 3 7/10
4) 40 5/9- Х= 63 4/5
Х=40 5/9- 63 4/5
Х= 40 5/9+ (-63 4/5)
Х=63 4/5- 40 5/9
НОК(5;9)=45 Х= 63 36/45- 40 25/45
Х= -23 11/45