Question

(3/7)^21:(9/49)/6

Answer 1

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