Resolva as frações; a) 3/4 + 1/3 = 1/2 b) 5/10 + 2/5 + 1/3 c) 10/7 + 1/14 d) 18/4 - 12/5 e) 2/3 + 2/.... Pergunta de ideia deChristiannkevyn

November 2019 1 41 Report

Resolva as frações; a) 3/4 + 1/3 = 1/2 b) 5/10 + 2/5 + 1/3 c) 10/7 + 1/14 d) 18/4 - 12/5 e) 2/3 + 2/5 + 3/6

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lelunardi1 a) 3/4 + 1/3 = 1/2 mmc = 12 divide pelo nr de baixo e
multiplica pelo nr de cima

12:4.3 12:3.1 12:2.1
-------- + --------- = --------
12 12 12 agora descarte os denominadores

3.3 + 4.1 = 6.1
9 + 4 = 6
9 + 4 - 6 =
13 - 6 = 7

b) 5/10 + 2/5 + 1/3 = mmc30

30:10.5 30:5.2 30:3.1
----------- + -------- + --------- =
30 30 30

3.5 + 6.2 + 10.1
-------------------------------- =
30

15 + 12 + 10 37
------------------ = -----
30 30

c) 10/7 + 1/14 = mmc 28

28:7.10 + 18:14.1
------------------------ =
28

4.10 + 2.1 40 + 2 42 3
---------------- = ------------ = ------- = simplificando por 14 = ----
28 28 28 2

d) 18/4 - 12/5 = mmc 20

20:4.18 - 20:5.12 5.18 - 4.12 90 - 48 42
--------------------------- = ----------------- = ------------- = ------ =
20 20 20 20

simplificando por 2 = 21/10

e) 2/3 + 2/5 + 3/6 = mmc 30

30:3.2 + 30:5.2 + 30:6.3 10.2 + 6.2 + 5.3 20 + 12 + 15
--------------------------------- = -------------------------- = ------------------- =
30 30 30

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