Matemática do Pi: Macete da Divisão por 5 - Rápido, Curto e Direto VEJA O VÍDEO

quarta-feira, 20 de maio de 2020

Macete da Divisão por 5 - Rápido, Curto e Direto VEJA O VÍDEO

Macete da Divisão por 5.

3:5= ???

✓Pega o dobro do número (ou seja , o dobro de 3 é 6).
✓Volta uma casa (ou seja, 0,6)😉

Entendeu?? 💪 3:5 = 0,6

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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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quarta-feira, 20 de maio de 2020

Macete da Divisão por 5 - Rápido, Curto e Direto VEJA O VÍDEO

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