1) Calcule o valor de cada expressão:
a) 1/2 +(-0,3) 1/6+ =
b)0,4-(-3/4)-(-1/2) =
c)(2-1/4)-(3-1/2) =
d) (1/3 – 1) - (2+1/2)-(1-1/4) =
e) (5 - 4/9-2/3) - (4/3- 7/15+4/3)=
f) 1/2+1/5-1/4+3/4=
g)-1/3+(3/5-2)=
h) 6-(0,7+1,5) - 0,4=
preciso das contas para hoje!!
Respostas
a) 1/2 + (-0,3) + 1/6 =
1/2 + (-3/10) + 1/6 =
>> mmc de 2, 10 e 6 = 30
15/30 + (-9/30) + 5/30 =
15 - 9 + 5 = 11
30 30
b) 0,4 - (-3/4) - (-1/2) =
4/10 + 3/4 + 1/2 =
>> mmc de 10, 4 e 2 = 40
16/40 + 30/40 + 20/40 =
16 + 30 + 20 = 66 ou 33
40 40 20
c) (2 - 1/4) - (3 - 1/2) =
(8/4 - 1/4) - (6/2 - 1/2) =
7/4 - 5/2 =
>> mmc de 4 e 2 = 4
7/4 - 10/4 =
7 - 10 = - 13
4 4
d) (1/3 – 1) - (2 + 1/2) - (1 - 1/4) =
(1/3 - 3/3) - (4/2 + 1/2) - (4/4 - 1/4) =
(-2/3) - (5/2) - (3/4) =
>> mmc de 3, 2 e 4 = 12
(-8/12) - (30/12) - (9/12) =
- 8 - 30 - 9 = - 47
12 12
e) (5 - 4/9 - 2/3) - (4/3 - 7/15 + 4/3) =
(45/9 - 4/9 - 6/9) - (20/15 - 7/15 + 20/15) =
(45 - 5 - 6) - (20 - 7 + 20) =
9 15
34 - 33 =
9 15
>> mmc de 9 e 15 = 45
102 - 99 = 3 ou 1
45 45 45 15
f) 1/2 + 1/5 - 1/4 + 3/4 =
1/2 + 1/5 + 2/4 =
>> mmc de 2, 5 e 4 = 20
10/20 + 4/20 + 10/20 =
10 + 4 + 10 = 24 ou 6
20 20 5
g) -1/3 + (3/5 - 2) =
- 1/3 + (3/5 - 10/5) =
- 1/3 - 7/5 =
>> mmc de 3 e 5 = 15
- 5/15 - 21/15 =
- 5 - 21 = - 26
15 15
h) 6 - (0,7 + 1,5) - 0,4 =
6 - (2,2) - 0,4 =
6 - 2,6 =
6 - 26/10 =
60/10 - 26/10 =
60 - 26 = 46 ou 23
10 10 5