Question

\(\dfrac{21}{\cdot}\) x 3 = \(\dfrac{7}{3}\)
a.9             b. 18           c.27         d. 28

Answer 1

\(\dfrac{21}{x}\times3=\dfrac{7}{3}\)

\(\dfrac{21}{x}=\dfrac{7}{3}:3\)

\(\dfrac{21}{x}=\dfrac{7}{3}\times\dfrac{1}{3}\)

\(\dfrac{21}{x}=\dfrac{7}{9}\)

\(21:x=\dfrac{7}{9}\)

\(x=21:\dfrac{7}{9}\)

\(x=27\)

Vậy Chọn C

Answer 2

C nha bạn

Answer 3

C

Answer 4

C.27

Answer 5

C