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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
35
+ 4
--------
39
52
+ 37
-------
89
68
- 6
-------
62
79
- 55
-- -----
24
35
+ 4
--------
39
52
+ 37
-------
89
68
- 6
-------
62
79
- 55
-- -----
24
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\begin{array}{*{20}{c}}{ - \begin{array}{*{20}{c}}{35}\\{28}\end{array}}\\\hline{\,\,\,\,\,\,7}\end{array}\) \(\begin{array}{*{20}{c}}{ - \begin{array}{*{20}{c}}{53}\\{34}\end{array}}\\\hline{\,\,\,19}\end{array}\)
\(\begin{array}{*{20}{c}}{ - \begin{array}{*{20}{c}}{80}\\{27}\end{array}}\\\hline{\,\,\,53}\end{array}\) \(\begin{array}{*{20}{c}}{ - \begin{array}{*{20}{c}}{90}\\{52}\end{array}}\\\hline{\,\,\,38}\end{array}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a ) 40 + 20 - 6 = 60 - 6 = 54
`->` B
b) 43 - 8 + 17 = 35 + 17 = 52
`->` C
![](https://rs.olm.vn/images/avt/0.png?1311)
25 + 6=31
44 + 7=51
73 + 8 =81
52 + 9 = 61
46 + 27 = 73
37 + 35 = 72
![](https://rs.olm.vn/images/avt/0.png?1311)
a: 42 + 35 = 77
b: 60 + 17 = 77
c: 81 + 16 = 97
d: 24 + 52 = 76
a) 42 + 35 = 77
b) 60 + 17 = 77
c) 81 + 16 = 97
d) 24 + 52 = 76
![](https://rs.olm.vn/images/avt/0.png?1311)
52 + 35 = 87
= 87
tk nha