Question

Giá trị của \(\sqrt{\dfrac{49}{0.09}}\) bằng 

(A) \(\dfrac{7}{3}\)                      (B) \(\dfrac{70}{3}\)                    (C) \(\dfrac{7}{30}\)                              (D) \(\dfrac{700}{3}\)

Hãy chọn đáp án đúng ?

 

Answer 1

Giá trị của bằng :

(A) \(\dfrac{7}{3}\) (B) \(\dfrac{70}{3}\) (C) \(\dfrac{7}{30}\) (D)

Answer 2

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Answer 3

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Ta có \(\sqrt{\dfrac{49}{0,09}}\) = \(\sqrt{7^2}\)\(\div\) \(\sqrt{\dfrac{3}{10}^2}\)

= \(\sqrt{7^2}\)\(\times\)\(\sqrt{\dfrac{10}{3}^2}\)

= \(\left|7\right|\)\(\times\)\(\left|\dfrac{10}{3}\right|\)

= \(\dfrac{7\times10}{3}\)

= \(\dfrac{70}{3}\)

Answer 4

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Answer 5

Chọn đáp án B

Answer 6

\(\left(B\right)\dfrac{70}{3}\)