Aula1 Atividade De Revisão Gabarito

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Atividade de Revisão: Matemática Aula 1 – Aritmética 03/02/2009 ( Gabarito) Prof. Marcelo Carvalho de Anias 1) Calcule o valor de cada uma das seguintes expressões numéricas a) –17 + 43 +14 +23 –45 = – 17 – 45 + 43 +14 + 23= – 62 + 80 = 18 b) 75 + 95 -105 +110 -125 -55 = 75 + 95 +110 – 105 – 125 -55 = 280 – 285 = – 5 c) 30 + [− 16 − (− 7 + 10 30 + [–16 –( + 3)] = 30 + [– 16 – 3] = 30 + [– 19]= 30 – 19 = 11

)]=

d) 36 - {14 + [− 57 − (− 33 − 49 + 50 ) ] 36 – { 14 +[ -57 – ( -82 + 50) ] } = 36 – { 14 + [- 57 – (- 32) ] } = 36 – { 14 +[ -57 + 32] } = 36 – { 14 + [ - 25 ] } = 36 – { 14 – 25 ] } = 36 – {- 11} = 36 + 11 = 47

}=

e) 25 – (- 3) x (-7) + (-6) x (+4) – (-16) = 25 + 3 x (- 7) – 6 x(+4) + 16 = 25 – 21 - 24 +16 = 25 + 16 – 21 – 24 = 41- 45 = - 4 f) 41 – 3 (- 4)2 + 60 – 20 : (-2)2 = 41 – 3 ( +16) + 1 – 20 : ( + 4) = 41 – 48 + 1 – 5 = 41 +1 – 48 – 5 = 42 – 53 = - 11 g)

2 5 1 + = 3 6 2 4 5 3 + - = 6 6 6 4+5−3 = 6 6 =1 6

h)

i)

−7 11 1 +1= 20 15 6 − 21 60 44 10 + = 60 60 60 60 − 21 − 44 − 10 + 60 = 60 − 75 + 60 = 60 − 15 − 1 = 60 4 14  − 21  :   = 15  25  14  − 25  x = 15  21  Efetuando-se as simplificações ( 15 com 25 e 14 com 21) vem: 2  − 5  − 10 x = 3  3  9

j)

9 + 100 9 100

+

1 25

1 = 4

1

1

25

-

3 1 1 + - = 10 5 2 3 2 5 + = 10 10 10 5−5 = 0. 10

4

=

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