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Unidade 2 - Ficha de Autoavaliação

Authored by Clara Durão

Mathematics

8th Grade

Used 53+ times

Unidade 2 - Ficha de Autoavaliação
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20 questions

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1.

MULTIPLE CHOICE QUESTION

15 mins • 5 pts

Considera o número (−7)−2\left(-7\right)^{-2} .

A potência equivalente de expoente positivo é:

(−7)2\left(-7\right)^2

727^2

−(−17)2-\left(-\frac{1}{7}\right)^2

(17)2\left(\frac{1}{7}\right)^2

2.

MULTIPLE CHOICE QUESTION

15 mins • 5 pts

A fração 14\frac{1}{4} pode ser escrita como:

(−2)2\left(-2\right)^2

2−22^{-2}

−2−2-2^{-2}

(14)0\left(\frac{1}{4}\right)^0

3.

MULTIPLE CHOICE QUESTION

15 mins • 5 pts

Qual das afirmações seguintes é verdadeira?

7−3×7−2=767^{-3}\times7^{-2}=7^6

3−4+3−1=3−53^{-4}+3^{-1}=3^{-5}

5−3×4−2=20−55^{-3}\times4^{-2}=20^{-5}

(32)−3=136\left(3^2\right)^{-3}=\frac{1}{3^6}

4.

MULTIPLE CHOICE QUESTION

15 mins • 5 pts

Qual das potências seguintes representa o número 181\frac{1}{81} ?

3273^{27}

3−43^{-4}

13−4\frac{1}{3^{-4}}

1327\frac{1}{3^{27}}

5.

MULTIPLE CHOICE QUESTION

15 mins • 5 pts

Qual é o menor dos seguintes números?

(−12)−5\left(-\frac{1}{2}\right)^{-5}

(−15)−2\left(-\frac{1}{5}\right)^{-2}

(25)2\left(\frac{2}{5}\right)^2

[(14)−1]3\left[\left(\frac{1}{4}\right)^{-1}\right]^3

6.

MULTIPLE CHOICE QUESTION

15 mins • 5 pts

Qual dos números seguintes é o maior?

(110)−7\left(\frac{1}{10}\right)^{-7}

10510^5

(−110)−9\left(-\frac{1}{10}\right)^{-9}

1004100^4

7.

MULTIPLE CHOICE QUESTION

15 mins • 5 pts

Qual dos seguintes números representa o valor da expressão 2023100÷2023982023^{100}\div2023^{98} ?

121^2

20231982023^{198}

120232\frac{1}{2023^2}

202322023^2

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