Matemática do Pi: Aperfeiçoamentos x Capacitação!!

quinta-feira, 4 de dezembro de 2008

Aperfeiçoamentos x Capacitação!!

De 04 a 06 de dezembro de 2008 Início do Curso "Mídias na Educação" em Paragominas !!

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QUESTÕES

Questão

A massa de uma célula é aproximadamente 7×10^-9 gramas. Um organismo possui cerca de 3×10¹¹ células. A massa total desse organismo, em gramas, é:

a) 2,1×10²
b) 2,1×10³
c) 2,1×10⁴
d) 2,1×10⁵
e) 2,1×10⁶

▶ Clique aqui para ver a resolução

Passo 1:

A massa total é dada por:

(7×10^-9) · (3×10¹¹)

Passo 2:

Multiplicamos os coeficientes:

7 · 3 = 21

Passo 3:

Somamos os expoentes:

10^-9 · 10¹¹ = 10²

Logo:

21×10²

Passo 4:

Escrevendo em notação científica:

21×10² = 2,1×10³

Resposta: letra B.

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QuestÃ£o

A massa de uma cÃ©lula Ã© aproximadamente 7Ã—10^-9 gramas. Um organismo possui cerca de 3Ã—10¹¹ cÃ©lulas. A massa total desse organismo, em gramas, Ã©:

a) 2,1Ã—10²
b) 2,1Ã—10³
c) 2,1Ã—10⁴
d) 2,1Ã—10⁵
e) 2,1Ã—10⁶

â–¶ Clique aqui para ver a resoluÃ§Ã£o

Passo 1:

A massa total Ã© dada por:

(7Ã—10^-9) Â· (3Ã—10¹¹)

Passo 2:

Multiplicamos os coeficientes:

7 Â· 3 = 21

Passo 3:

Somamos os expoentes:

10^-9 Â· 10¹¹ = 10²

Logo:

21Ã—10²

Passo 4:

Escrevendo em notaÃ§Ã£o cientÃfica:

21Ã—10² = 2,1Ã—10³

Resposta: letra B.

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quinta-feira, 4 de dezembro de 2008

Aperfeiçoamentos x Capacitação!!

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