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=9x2^25-2^2x2^26/2^24x5^2-2^27x3
=9x2^25-2^28/2^24x5^2-2^27x3
=2^25x(9-2^3)/2^24x(5^2-2^3x3)
=2^25/2^24
=2^1=2
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Ta có: \(A=1+2+2^2+....+2^{100}\)
\(\Rightarrow2A=2.\left(1+2+2^2+...+2^{100}\right)\)
\(\Rightarrow2A=2+2^2+2^3+...+2^{101}\)
\(\Rightarrow2A-A=\left(2+2^2+2^3+...+2^{101}\right)-\left(1+2+2^2+...2^{100}\right)\)
\(\Rightarrow A=2^{101}-1\)
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Ta có: 72x-62x = 13.23-26 => x(72-62) = 13.8-26 => 13x = 78 => x = 78:13 => x = 6 Vậy, x = 6.
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162-23+17^17/7^26+17^26/17^26
139+1/(17^9)+1
140+1/(17^9)
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2^39=2^(3.13)=(2^3)^13=8^13
3^26=3^(13.2)=(3^2)^13=9^13
8^13.9^13=72^13
239 . 326
= (23)13 . (32)13
= 813 . 913
= (8 . 9)13
= 7213