efetue as adições a)-1/4-3/4+1/8 b)-3+11/5 c)2/3-1/4
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a)
-1/4-3/4+1/8
- 1 - 3 + 1 - 4 1
----- ----- ---- = ------- + -----
4 4 8 4 8
= - 1 + 1 = - 8 + 1 - 7
----- ----------- = ------
8 8 8
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
b)
= -3+11/5
- 3 + 11 = - 5.3 + 11 - 15 + 11 - 4
---- -------------- = ------------- = --------
5 5 5 5
c)
2/3-1/4
2 - 1 4.2 - 3.1 8 - 3 5
------ ---- = ------------- = -------- = ------
3 4 12 12 12
-1/4-3/4+1/8
- 1 - 3 + 1 - 4 1
----- ----- ---- = ------- + -----
4 4 8 4 8
= - 1 + 1 = - 8 + 1 - 7
----- ----------- = ------
8 8 8
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
b)
= -3+11/5
- 3 + 11 = - 5.3 + 11 - 15 + 11 - 4
---- -------------- = ------------- = --------
5 5 5 5
c)
2/3-1/4
2 - 1 4.2 - 3.1 8 - 3 5
------ ---- = ------------- = -------- = ------
3 4 12 12 12
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