resolva a soma de fração a)1/5+2/3+6/5 b)2/3+1/6+3/2c)7/5+2/3+1/5d)3/2+1/7+2/3Me ajude, gente pfvr
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a)1/5+2/3+6/5
1 + 2 + 6 = 7 + 2 3.7 + 5.2
----- ----- ---- ---- ----- = ---------------
5 3 5 5 3 15
21 + 10 31
------------ = -------
15 15
*****************************
b)2/3+1/6+3/2
2 + 1 + 3 2.2 + 1.1 + 3.3 = 4 + 1 + 9
----- ----- ----- = ------------------------ ----------------
3 6 2 6 6
= 14 (:2) = 7
------- -----
6 (:2) 3
mmc (3,6,2) = 6
3,6,2: 2
3,3,1: 3
-----------------------
1,1,1 = 2.3 = 6
********************************************
c)7/5+2/3+1/5
7 + 2 + 1
------ ------ -----
5 3 5
8 + 2 3.8 + 5.2 = 24 + 10 = 34
------ ------ = -------------- ------------- ------
5 3 15 15 15
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
d)3/2+1/7+2/3
3 + 1 + 2 21.3 + 6.1 + 14.2
----- ----- ----- = ---------------------------
2 7 3 42
63 + 6 + 28 = 69 + 28 = 97
------------------ ------------- ------
42 42 42
**************************************
mmc (2,7,3) = 42
2,7,3: 2
1,7,3: 3
1,7,1: 7
------------------
1,1,1 = 2.3.7 = 6.7 = 42
1 + 2 + 6 = 7 + 2 3.7 + 5.2
----- ----- ---- ---- ----- = ---------------
5 3 5 5 3 15
21 + 10 31
------------ = -------
15 15
*****************************
b)2/3+1/6+3/2
2 + 1 + 3 2.2 + 1.1 + 3.3 = 4 + 1 + 9
----- ----- ----- = ------------------------ ----------------
3 6 2 6 6
= 14 (:2) = 7
------- -----
6 (:2) 3
mmc (3,6,2) = 6
3,6,2: 2
3,3,1: 3
-----------------------
1,1,1 = 2.3 = 6
********************************************
c)7/5+2/3+1/5
7 + 2 + 1
------ ------ -----
5 3 5
8 + 2 3.8 + 5.2 = 24 + 10 = 34
------ ------ = -------------- ------------- ------
5 3 15 15 15
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
d)3/2+1/7+2/3
3 + 1 + 2 21.3 + 6.1 + 14.2
----- ----- ----- = ---------------------------
2 7 3 42
63 + 6 + 28 = 69 + 28 = 97
------------------ ------------- ------
42 42 42
**************************************
mmc (2,7,3) = 42
2,7,3: 2
1,7,3: 3
1,7,1: 7
------------------
1,1,1 = 2.3.7 = 6.7 = 42
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