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ĐẶT A=8.8^2.8^3. ... .8^20 B=5^1.5^2.5^100 8A=2.(8.8^2.8^3. ... .8^20) =8^2.8^3.8^4. ... .8^21 8A-A=(8^2.8^3.8^4. ... .8^21)-(8.8^2.8^3. ... .8^21) 7 A=8^21-1 A=(8^21-1):7 5B=5.(5^1.5^2.5^100)=5^2.5^3.5^101 5B-B=(5^2.5^3.5^101)-(5^1.5^2 .5^100) 4B=5^3.5^101-5^1.5^100
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)