4 целых 1/5 - 23 целых 3/10 = 4 - 23 + 1/5 - 3/10
= -19 + 1/5 - 3/1= -19 + 2/10 - 3/1= -19 - 1/1= -19 1/10
4 целых 1/5 - 23 целых 3/10 = 4 - 23 + 1/5 - 3/10
= -19 + 1/5 - 3/1
= -19 + 2/10 - 3/1
= -19 - 1/1
= -19 1/10