Question

1)4-7/12+1 5/6+2 1/3-1 1/4
2) 6 3/5-2 7/15+8 3/4-1 1/60
3) 9 11/18-5 3/4-1 15/36+2 7/9
4) 5 5/8+8 3/4-6 1/5+3
Помогите пожалуйста!
Даю 40 балов

Answer 1

Ответ:

Пошаговое объяснение:

1) 4 -7/12+1 5/6+2 1/3-1 1/4

а) 4-7/12=3 5/12

б) 3 5/12+1 5/6= 4+(5/12+10/12)=

4 + 1 1/4= 5 1/4

в) 5 1/4+2 1/3=7+(3/12+4/12)= 7 7/12

г) 7 7/12-1 1/4=6+(7/12-3/12)=

6 1/3

2) 6 3/5-2 7/15+8 3/4-1 1/60

а)6 3/5-2 7/15=4+(9/15-7/15)=4 2/15

б)4 2/15-1 1/60=3 +(8/60-1/60)

=3 7/60

в) 8 3/4+3 7/60=

11+(45/60+7/60)=11 13/15

3)9 11/18 - 5 3/4 - 1 15/36 + 2 7/9 = 9 22/36 - 5 27/36 + 1 15/36 + 2 28/36 =

= (9 22/36 + 1 15/36 + 2 28/36) - 5 27/36 = 13 29/36 - 5 27/36 = 8 2/36 = 8 1/18

4)5 5/8 + 8 3/4 - 6 1/5 + 3 = 5 25/40 + 8 30/40 - 6 8/40 + 3 = (5 25/40 + 8 30/40 + 3) - 6 8/40 = 17 15/40 - 6 8/40 = 11 7/40