Question

помогите пожалуйста 858

Answer 1

1)) 0,8+ 3/7= 8/10+3/7= 4/5+ 3/7=
(4•7)/(5•7)+ (3•5)/(7•5)=
28/35+ 15/35= 43/35= 1 8/35

2)) 26 1/11 -5,7= 26 1/11- 5 7/10=
26 (1•10)/(11•10) - 5 (7•11)/(10•11)=
26 10/110- 5 77/110=
25 (110•1+10)/110 - 5 77/110=
25 120/110- 5 77/110=
20 43/110.


3)) 4,9+ 1 1/9= 4 9/10+ 1 1/9=
4 (9•9)/(10•9) + 1 (1•10)/(9•10)=
4 81/90+ 1 10/90= 5 91/90= 6 1/90




4)) 3 1/3- 2,5= 3 1/3- 2 1/5=
3 (1•5)/(3•5)- 2 (1•3)/(5•3)=
3 5/15- 2 3/15=
1 2/15.


5)) 40,8 +15 2/3= 40 8/10+ 15 2/3=
40 4/5+ 15 2/3=
40 (4•3)/(5•3) + 15 (2•5)/(3•5)=
40 12/15+ 15 10/15=
55 22 15= 56 7/15

6)) 18 5/13- 9,5= 18 5/13- 9 5/10=
18 5/13- 9 1/2=
18 (5•2)/(13•2)- 9 (1•13)/(2•13)=
18 10/26- 9 13/26=
17 (26•1+10)/26- 9 13/26 =
17 36/26- 9 13/26= 8 23/36