calcule o valor Das expressões :a)3/5-1-2/5
B)4-1/10+2/5
C)1/2-(-3/5+7/10
D)-2-(1/2+1/8
E)5/12+(-1/4-(+1/6
URGENTE!!!!!!!!!! Com mmc pf
Respostas
respondido por:
4
A) 3/5 -1 -2/5 = mmc = 5 (só tem ele de denominador)
3 2
---- - 1 - ----- =
5 5
5:5x3 5x1 5:5x2
-------- - ----- - -------- =
5 5 5
3 5 2
-------- - ----- - -------- =
5 5 5
3 - 5 - 2
------------- =
5
3 -7 -4
-------- = --------
5 5
...
B) 4 -1/10 +2/5 = mmc10,5/2
5,1/5
10x4 10:10x1 10:5x2 1,1/ = 2.5 = 10
------- - ----------- + --------- =
10 10 10
40 1 4
------- - ----------- + --------- =
10 10 10
40 - 1 + 4 39 + 4 43
------------- = ----------- = --------
10 10 10
...
C)1/2-(-3/5+7/10)
mmc dos parênteses
5, 10/2
5, 5/5
1, 1/ = 2.5 = 10
1 ( 10:5x2 10:10x7)
------ - ------------ + ------------ =
2 10 10
1 ( 4 7)
------ - ------------ + ------------ =
2 10 10
1 ( 4 + 7 )
------ - -------------- =
2 10
1 11
------ - -------------- =
2 10 mmc 2,10/2
1, 5/5
1.1/= 2.5 = 10
10:2x1 10:10x11
---------- - ------------ =
10 10
5 11 -6 -3
---------- - ------------ = --------- = simplif. por 2 = -----
10 10 10 5
...
D) -2 -(1/2+1/8) mmc 2, 8/2
1, 4/2
1,2/2
1,1/= 2.2.2= 8
-2 - ( 8:2x1 8:8x1)
--------- + --------- =
8 8
-2 - ( 4 1 )
---- + ----- =
8 8
-2 - 5/8 = mmc = 8
8.2 8:8x5
- ----- - -------- =
8 8
16 5 21
- ----- - -------- = - -----
8 8 8
...
E) 5/12 +(-1/4 -(+1/6)) =
5/12 +(-1/4 - 1/6) = mmc 4,6/2
2,3/2
1,3/3
1,1/= 2.2.3 = 12
5 ( 12:4x1 12:6x1)
------ + - --------- - ---------- =
12 12 12
5 ( 3 2)
------ + - --------- - ---------- =
12 12 12
5 ( -5 ) 5 -5 0
---- + ------ = ------- = ----- = 0
12 12 12 12
3 2
---- - 1 - ----- =
5 5
5:5x3 5x1 5:5x2
-------- - ----- - -------- =
5 5 5
3 5 2
-------- - ----- - -------- =
5 5 5
3 - 5 - 2
------------- =
5
3 -7 -4
-------- = --------
5 5
...
B) 4 -1/10 +2/5 = mmc10,5/2
5,1/5
10x4 10:10x1 10:5x2 1,1/ = 2.5 = 10
------- - ----------- + --------- =
10 10 10
40 1 4
------- - ----------- + --------- =
10 10 10
40 - 1 + 4 39 + 4 43
------------- = ----------- = --------
10 10 10
...
C)1/2-(-3/5+7/10)
mmc dos parênteses
5, 10/2
5, 5/5
1, 1/ = 2.5 = 10
1 ( 10:5x2 10:10x7)
------ - ------------ + ------------ =
2 10 10
1 ( 4 7)
------ - ------------ + ------------ =
2 10 10
1 ( 4 + 7 )
------ - -------------- =
2 10
1 11
------ - -------------- =
2 10 mmc 2,10/2
1, 5/5
1.1/= 2.5 = 10
10:2x1 10:10x11
---------- - ------------ =
10 10
5 11 -6 -3
---------- - ------------ = --------- = simplif. por 2 = -----
10 10 10 5
...
D) -2 -(1/2+1/8) mmc 2, 8/2
1, 4/2
1,2/2
1,1/= 2.2.2= 8
-2 - ( 8:2x1 8:8x1)
--------- + --------- =
8 8
-2 - ( 4 1 )
---- + ----- =
8 8
-2 - 5/8 = mmc = 8
8.2 8:8x5
- ----- - -------- =
8 8
16 5 21
- ----- - -------- = - -----
8 8 8
...
E) 5/12 +(-1/4 -(+1/6)) =
5/12 +(-1/4 - 1/6) = mmc 4,6/2
2,3/2
1,3/3
1,1/= 2.2.3 = 12
5 ( 12:4x1 12:6x1)
------ + - --------- - ---------- =
12 12 12
5 ( 3 2)
------ + - --------- - ---------- =
12 12 12
5 ( -5 ) 5 -5 0
---- + ------ = ------- = ----- = 0
12 12 12 12
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