Question

Bài 67 (trang 36 SGK Toán 9 Tập 1)

Hãy tìm

$\sqrt[3]{512}$ ; $\sqrt[3]{-729}$ ; $\sqrt[3]{0,064}$ ; $\sqrt[3]{-0,216}$ ; $\sqrt[3]{-0,008}$.

Answer 1

Ta có:

+ 3√512=3√83=8;5123=833=8;

+ 3√−729=3√(−9)3=−9;−7293=(−9)33=−9;

+ 3√0,064=3√0,43=0,4;0,0643=0,433=0,4;

+ 3√−0,216=3√(−0,6)3=−0,6;−0,2163=(−0,6)33=−0,6;

+ 3√−0,008=3√(−0,2)3=−0,2.

Answer 2

Đáp án:

( lần lượt như trên nhé!!! Ko viết lại đề)

8 ; - 9 ; 0,4 ; - 0,6 ; - 0,2

Answer 3

Kết quả lần lượt là $8$ ; $-9$ ; $0,4$ ; $-0,6$ ; $-0,2$

Answer 4

lần lượt là $8$ ; $-9$ ; $0,4$ ; $-0,6$ ; $-0,2$.

Answer 5

\(\sqrt[3]{512}=8\)

\(\sqrt[3]{-729}=-9\)

\(\sqrt[3]{0,064}=0,4\)

\(\sqrt[3]{-0,216}=-0,6\)

\(\sqrt[3]{-0,008}=-0,2\)

Answer 6

8;-9;0,4;-0;6;-0,2

Answer 7

³\(\sqrt[]{512}\) = ³\(\sqrt{8}\)³ = 8      

³\(\sqrt{-729}\) = ³\(\sqrt{\left(-9\right)}\) ³ = -9

³\(\sqrt{0,064}\) = ³\(\sqrt[]{\left(0,4\right)}\) = 0,4

³\(\sqrt{-0,216}\) = ³\(\sqrt{\left(-0,6\right)}\)³ = -0,6

³\(\sqrt{-0,008}\) = ³\(\sqrt{\left(-0,2\right)}\)³ = -0,2

Answer 8

\(\sqrt[3]{512}\)=8

\(\sqrt[3]{-729}\)=9

\(\sqrt[3]{0,064}\)=0.4

\(\sqrt[3]{-0,216}\)=-0.6

\(\sqrt[3]{-0,008}\)=0,2

Answer 9

8 ; -9 ; 0,4 ; -0,6 ; -0,2

Answer 10

∛512 = ∛83 = 8

∛-729 = ∛(-9)3 = -9

∛0,064 = ∛(0,4)3 = 0,4

∛-0,216 = ∛(-0,6)3 = -0,6

∛-0,008 = ∛(-0,2)3 = -0,2

Answer 11

Answer 12

8,9,0,4;-0,6;0.2

 

Answer 13

∛512 = ∛83 = 8

∛-729 = ∛(-9)3 = -9

∛0,064 = ∛(0,4)3 = 0,4

∛-0,216 = ∛(-0,6)3 = -0,6

∛-0,008 = ∛(-0,2)3 = -0,2

Answer 14

\(\sqrt[3]{512}=8\\ \sqrt[3]{-729}=-9\\ \sqrt[3]{-0,216}=-0,6\\ \sqrt[3]{0,064}=0,4\\\sqrt[3]{-0,008}=-0,2 \)

Answer 15

\(\sqrt[3]{512}=\sqrt[3]{8^3}=8\)

\(\sqrt[3]{-729}=\sqrt[3]{\left(-9\right)^3}=-9\)

\(\sqrt[3]{0,064}=\sqrt[3]{\dfrac{8}{125}}=\sqrt[3]{\left(\dfrac{2}{5}\right)^3}=\dfrac{2}{5}\)

\(\sqrt[3]{-0,216}=\sqrt[3]{-\dfrac{27}{125}}=\sqrt[3]{\left(-\dfrac{3}{5}\right)^3}=-\dfrac{3}{5}\)

\(\sqrt[3]{-0,008}=\sqrt[3]{-\dfrac{1}{125}}=\sqrt[3]{\left(-\dfrac{1}{5}\right)^3}=-\dfrac{1}{5}\)

 

Answer 16

\(\sqrt[3]{512}=\sqrt[3]{8^3}=8\)

\(\sqrt[3]{-729}=\sqrt[3]{\left(-9\right)^3}=-9\)

\(\sqrt[3]{0,064}=\sqrt[3]{\left(0,4\right)^3}=0,4\)

\(\sqrt[3]{-0,216}=\sqrt[3]{\left(-0,6\right)^3}=-0,6\)

\(\sqrt[3]{-0,008}=\sqrt[3]{\left(-0,2\right)^3}=-0,2\)

Answer 17

\(\sqrt[3]{512}=\sqrt[3]{8^3}=8\)

\(\sqrt[3]{-729}=\sqrt[3]{-9^3}=-9\)

\(\sqrt[3]{0,064}=\sqrt[3]{0,4^3}=0,4\)

\(\sqrt[3]{0,216}=\sqrt[3]{0,6^3}=0,6\)

\(\sqrt[3]{-0,008}=\sqrt[3]{-0,2^3}=-0,2\)

Answer 18

\(\sqrt[3]{512}=\sqrt[3]{8^3}=8\); \(\sqrt[3]{-729}=\sqrt[3]{-9^3}=-9\); \(\sqrt[3]{0,064}=\sqrt[3]{0,4^3}=0,4\); \(\sqrt[3]{-0,216}=\sqrt[3]{-0,6^3}=-0,6\); \(\sqrt[3]{-0,008}=\sqrt[3]{-0,2^3}=-0,2\)

Answer 19

Answer 20

8,-9,0.4,-0.6,-0.2

Answer 21

8;-9;0,4;-0,6;-0,2

Answer 22

\(\sqrt[3]{512}=\sqrt[3]{8^3}=8\)

\(\sqrt[3]{-729}=\sqrt[3]{-9^3}=-9\)

\(\sqrt[3]{0,064}=\sqrt[3]{0,4^3}=0,4\)

\(\sqrt[3]{-0,216}=\sqrt[3]{-0,6^3}=-0,6\)

\(\sqrt[3]{-0,008}=\sqrt[3]{-0,2^3}=-0,2\)

Answer 23

8;-9;0,4;-0,6;-0,2

Answer 24

8;-9;0,4;-0,6;-0,2

Answer 25

8 ; -9 ; 0,4 ; -0,6 ; -0,2

Answer 26

8;-9;0,4;-0,6;-0,2

Answer 27

 

Answer 28

kết quả lần lượt là 8;-9;-0,4;-0,6;-0,2

 

Answer 29

Answer 30

\(\sqrt[3]{512}=\sqrt[3]{8^3}=8\)

\(\sqrt[3]{-729}=\sqrt[3]{\left(-9\right)^3}=9\)

\(\sqrt[3]{0,064}=\sqrt[3]{0,4^3}=0,4\)

\(\sqrt[3]{-0,216}=\sqrt[3]{\left(-0,6\right)^3}=-0,6\)

\(\sqrt[3]{-0,008}=\sqrt[3]{\left(-0,2\right)^3}=-0,2\)