(3/7)^21:[(3/7)^2]^6

(3/7)^21:[(3/7)^12

(3/7)^21-12

^{(3/7)^9}

(3/7)²¹: (9/49)⁶

= (3/7)²¹: (3²/7²)⁶

= (3/7)²¹: (3/7)¹²

= (3/7)^21-12

= (3/7)⁹

=(3/7)^9 lol

\(\left(\frac{3}{7}\right)^{21}:\left(\frac{9}{49}\right)^6=\left(\frac{3}{7}\right)^{21}:\left(\frac{3^2}{7^2}\right)^6=\left(\frac{3}{7}\right)^{21}:\left[\left(\frac{3}{7}\right)^2\right]^6=\left(\frac{3}{7}\right)^{21}:\left(\frac{3}{7}\right)^{12}=\left(\frac{3}{7}\right)^{21-12}=\left(\frac{3}{7}\right)^9\)

\(\left(\frac{3}{7}\right)^{21}:\left(\frac{9}{49}\right)^6=\left(\frac{3}{7}\right)^{21}:\left(\left(\frac{3}{7}\right)^2\right)^6\)

\(=\left(\frac{3}{7}\right)^{21}:\left(\frac{3}{7}\right)^{12}\)

\(=\left(\frac{3}{7}\right)^{21-12}\)

\(=\left(\frac{3}{7}\right)^9\)

\(\left(\frac{3}{7}\right)^{21}:\left(\frac{9}{49}\right)^6\)
\(=\left(\frac{3}{7}\right)^{21}:\left(\left(\frac{3}{7}\right)^2\right)^6=\left(\frac{3}{7}\right)^{21}:\left(\frac{3}{7}\right)^{12}=\left(\frac{3}{7}\right)^{21-12}=\left(\frac{3}{7}\right)^9\)

\(\left(\frac{3}{7}\right)^{21}\div\left(\frac{9}{49}\right)^6=\left(\frac{3}{7}\right)^{21}\div\left[\left(\frac{3}{7}\right)^2\right]^6=\left(\frac{3}{7}\right)^{21}\div\left(\frac{3}{7}\right)^{12}=\left(\frac{3}{7}\right)^9\)

\(\left(\frac{3}{7}\right)^{21}\div\left(\frac{9}{49}\right)^6\)

\(=\left(\frac{3}{7}\right)^{21}:\left(\frac{3}{7}\right)^{2^6}\)

\(=\left(\frac{3}{7}\right)^{21}:\left(\frac{3}{7}\right)^{12}\)

\(=\left(\frac{3}{7}\right)^{21-12}\)

\(=\left(\frac{3}{7}\right)^9\)

\(\left(\frac{3}{7}\right)^{21}\div\left(\frac{9}{49}\right)^6=\left(\frac{3}{7}\right)^{21}\div\left[\left(\frac{3}{7}\right)^2\right]^6=\left(\frac{3}{7}\right)^{21}\div\left(\frac{3}{7}\right)^{12}=\left(\frac{3}{7}\right)^9\)

Bn chỉnh lại đề đi sao lại tiếng anh hả vào toán đi ko được tick đâu

(\(\frac{3}{7}\))²¹ : (\(\frac{9}{49}\))⁶       

  ^{=(\(\frac{3}{7}\))21 : [(\(\frac{3}{7}\))2]6}

   ^{= ( \(\frac{3}{7}\)})^{21 : (\(\frac{3}{7}\))12} 

   ^{= ( \(\frac{3}{7}\)})^{21-12  =} (\(\frac{3}{7}\))⁹ 

\(\left(\frac{3}{7}\right)^{21}:\left(\frac{9}{49}\right)^6=\left(\frac{3}{7}\right)^{21}:\left(\left(\frac{3}{7}\right)^2\right)^6=\left(\frac{3}{7}\right)^{21}:\left(\frac{3}{7}\right)^{2.6}=\left(\frac{3}{7}\right)^{21}:\left(\frac{3}{7}\right)^{12}\)

\(=\left(\frac{3}{7}\right)^{21-12}=\left(\frac{3}{7}\right)^9\)

\(\left(\frac{3}{7}\right)^{21}:\left(\frac{9}{49}\right)^6\\ =\left(\frac{3}{7}\right)^{21}:\left(\frac{3}{7}^2\right)^6\\ =\left(\frac{3}{7}\right)^{21}:\left(\frac{3}{7}\right)^{2.6}\\ =\left(\frac{3}{7}\right)^{21}:\left(\frac{3}{7}\right)^{12}\\ =\left(\frac{3}{7}\right)^{21-12}\\ =\left(\frac{3}{7}\right)^9\)

Lời giải:
\((\frac{3}{7})^{21}:(\frac{9}{49})^6=(\frac{3}{7})^{21}:[(\frac{3}{7})^2]^{6}=(\frac{3}{7})^{21}:(\frac{3}{7})^{12}\\ =(\frac{3}{7})^{21-12}=(\frac{3}{7})^9\)