Question

(2 целых три пятых-0,4)-(3 целых одна пятая-2,1)

Answer 1

(2.3/5-0,4)-(3.1/5-2,1)=
1)2.3/5-0,4=2.3/5-4/10=2.6/10-4/10=2.2/10
2)3.1/5-2,1=3.1/5-2.1/10=3.2/10-2.1/10=1.1/10
3)2.2/10-1.1/10=1.1/10