2^98=2^90.2^8=(2^9)^10.4^4=512^10.4^4
5^47=5^40.5^7=(5^4)^10.5^7=625^10.5^7
Ta thấy: 512^10<625^10
4^4<5^7
=>>>> 512^10.4^4<625^10.5^7
=>>> 2^98<5^47
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