[ Toán 7 ] So sánh các số sau đây

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phamhuy20011801

$a, 5^{36}=5^2.5^{34}<2^{34}.5^{34}=10^{34}<11^{34}$
$b, 27^{11}=3^{33} > 3^{32}=81^8$
$c, 5^{23} = 5. 5^{22} < 6.5^{22}$
$d, 7.2^{13} < 8.2^{13}=2^3.2^{13}=2^{16}$
$e, 21^{15} = 3^{15}.7^{15} < 3^{15}.7^{16}=27^5.49^8$
$g, 199^{20} < 200^{20}=200^5.200^{15}=2^5.10^{10}.200^{15}<10^{15}.200^{15}=2000^{15}<2003^{15}$
$h, 3^{39} < 3^{42}=9^{21}<11^{21}$
$i, 72^{45}-72^{44}=72^{44}.(72-1)<72^{43}(72-1)=72^{44}-72^{43}$
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