\(\dfrac{72^3\cdot54^2}{108^4}\)
\(=\dfrac{36^3\cdot2^3\cdot54^2}{54^4\cdot2^4}\)
\(=\dfrac{36^3\cdot54^2\cdot1}{54^4\cdot2}\)
\(=\dfrac{36^3}{2^3\cdot3^6}\)
\(=\dfrac{18^3}{3^6}=\dfrac{18^3}{\left(3^2\right)^3}=\dfrac{18^3}{9^3}=2^3=8\)
\(\dfrac{2^{10}\cdot15+2^{10}\cdot65}{2^8\cdot104}\)
\(=\dfrac{2^{10}\cdot\left(15+65\right)}{2^8\cdot108}\)
\(=\dfrac{2^{10}\cdot80}{2^8\cdot104}\)
\(=\dfrac{2^2\cdot2^4\cdot5}{2^3\cdot13}\)
\(=\dfrac{2^6\cdot5}{2^3\cdot13}=\dfrac{2^3\cdot5}{13}=\dfrac{8\cdot5}{13}=\dfrac{40}{13}\)
Nhìn đc mỗi 2 câu này :(
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