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Tử = 12 + 8 + 2 = 22
Mẫu = 2 + 18 - 30 = -10
=> Phân số trên là -22 / 10
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Tử số : \(4^5.9^4-2.6^9\)
\(=\left(2^2\right)^5.\left(3^2\right)^4-2.2^9.3^9\)
\(=2^{10}.3^8-2^{10}.3^9\)
Mẫu số : \(2^{10}.3^8+6^8.20\)
\(=2^{10}.3^8+2^8.3^8.2^2.5\)
\(=2^{10}.3^8+2^{10}.3^8.5\)
\(=2^{10}.3^8.6\)
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\(A=\dfrac{2^{20}\cdot3^{10}\cdot35+2^{10}\cdot65+2^2\cdot3^2\cdot2^{12}\cdot3^6\cdot3^2\cdot5^2}{2^{12}\cdot5^4}\)
\(=\dfrac{2^{10}\left(2^{10}\cdot3^{10}\cdot35+65+2^4\cdot3^{10}\cdot5^2\right)}{2^{12}\cdot5^4}\)
\(=\dfrac{1}{4}\cdot\dfrac{2^4\cdot3^{10}\cdot5\cdot\left(2^6\cdot7+5\right)+65}{5^4}\)
\(=\dfrac{1}{4}\cdot\dfrac{2^4\cdot3^{11}\cdot5\cdot151+65}{5^4}\)
\(=\dfrac{1}{4}\cdot\dfrac{2^4\cdot3^{11}\cdot151+13}{5^3}=\dfrac{2^4\cdot3^{11}\cdot151+13}{500}\)
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a.
=(5^7+5^9)(6^8+6^10)(16-4^2)
=(5^7+5^9)(6^8+6^10)(16-16)
=(5^7+5^9)(6^8+6^10).0
=0