Question

-Tính giá trị của biểu thức sau :

(1/16)^7/(1/8)^9

Answer 1

Ý bạn có phải là:

\(\left(\dfrac{1}{16}\right)^7:\left(\dfrac{1}{8}\right)^9\)

Answer 2

\(\left(\dfrac{1}{16}\right)^7:\left(\dfrac{1}{8}\right)^9\)

= \(\left(\dfrac{1^7}{16^7}\right):\left(\dfrac{1^9}{8^9}\right)\)

= \(\left(\dfrac{-1}{\left(2^4\right)^7}\right):\left(\dfrac{-1}{\left(2^3\right)^9}\right)\)

= \(\left(\dfrac{-1}{2^{28}}\right):\left(\dfrac{-1}{2^{27}}\right)\)

= \(\left(\dfrac{-1}{2^{28}}\right).\left(\dfrac{2^{27}}{-1}\right)\)

= \(\dfrac{1}{2}\)