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\(A=\frac{72^3\times54^2}{108^4}\)
\(\Rightarrow A=\frac{\left(2^3\times3^2\right)^3\times54^2}{\left(54\times2\right)^4}\)
\(\Rightarrow A=\frac{\left(2^3\right)^3\times\left(3^2\right)^3\times54^2}{54^4\times2^4}\)
\(\Rightarrow A=\frac{2^9\times3^6\times54^2}{54^2\times54^2\times2^4}\)
\(\Rightarrow A=\frac{2^5\times3^6}{54^2}\)
\(\Rightarrow A=\frac{2^5\times3^6}{\left(2\times3^3\right)^2}\)
\(\Rightarrow A=\frac{2^2\times2^3\times3^6}{2^2\times\left(3^3\right)^2}\)
\(\Rightarrow A=\frac{2^3\times3^6}{3^6}\)
\(\Rightarrow A=2^3=8\)
\(B=\frac{3^{10}\times11+3^{10}\times5}{3^9\times2^4}\)
\(\Rightarrow B=\frac{3^{10}\times\left(11+5\right)}{3^9\times2^4}\)
\(\Rightarrow B=\frac{3^{10}\times16}{3^9\times16}\)
\(\Rightarrow B=\frac{3^{10}}{3^9}=3\)

a, \(A=\dfrac{3^{10}.11+3^{10}.5}{3^9.2^4}=\dfrac{3^{10}.\left(11+5\right)}{3^9.2^4}\)
\(=\dfrac{3^{10}.2^4}{3^9.2^4}=3\)
b, \(B=\dfrac{2^{10}.13+2^{10}.65}{2^8.104}=\dfrac{2^{10}.78}{2^8.104}\)
\(=\dfrac{2^2.3}{4}=3\)
c, \(C=\dfrac{4^9.36+64^4}{16^4.100}=\dfrac{\left(2^2\right)^9.36+\left(2^6\right)^4}{\left(2^4\right)^4.100}\)
\(=\dfrac{2^{18}.36+2^{24}}{2^{16}.100}=\dfrac{2^{18}.\left(36+2^6\right)}{2^{16}.100}\)
\(=\dfrac{2^4.100}{100}=2^4=16\)
Câu d làm tương tự! Chúc bạn học tốt!!!



\(5^8:25^2=5^8:5^4\)
=54=625
\(4^9:64^2=4^9:\left(2^2\right)^6\)
=49:46
=43=64

\(4.3^{x+3}+3^x=108.9\)
\(\Leftrightarrow4.3^x.27+3^x=972\)
\(\Leftrightarrow3^x\left(108+1\right)=972\)
\(\Leftrightarrow3^x=\frac{972}{109}\)
Vậy không tìm được x thỏa mãn yêu cầu đề bài .

58 : 252 = 58 : (52)2
= 58 : 54
= 54
49 : 642 = 49 : (43)2
= 49 : 46
= 43

a) 36 : 32 + 23 . 34
= ( 36-2) + 8 . 81
= 34 + 648
= 81 + 648
= 729
b) 21 . { 108 : 9 -[ 235 - ( 273 - 43)]}
= 21 . { 108 : 9 -[ 235 - 230 ] }
= 21 . { 108 :9 - 5 }
= 21 . {12 - 5 }
= 21 . 7
= 147
^^
\(9^{39}:108^{4}=9^{39}:(9.12)^{4}\)
\(=9^{39}:9^{4}:12^{4}\)
\(=9^{35}:12^{4}\)
\(=(3^{2})^{35}:(3.4)^{4}\)
\(=3^{70}:3^{4}:4^{4}\)
\(=3^{66}:4^{4}\)
A= \(9^{39}\div108^4=3^{2.39}:\left(4.3^3\right)^4=3^{78}\div4^4.3^{12}\)
\(=\dfrac{1}{4^4}\times3^{78-12}=\dfrac{1}{4^4}\times3^{66}=\dfrac{3^{66}}{4^4}\)