so sánh: \(2^{225}v\text{à}\)\(3^{150}\)
so sánh;
a) \(3^{1234}v\text{à}2^{1851}\)
31234 = (32)617 = 9617
21851 = (23)617 = 8617
Ta thấy: 9>8 => 31234 > 21851
So sánh\(2^{30}+3^{30}+4^{30}v\text{à}3.24^{10}\)
So sánh với n thuộc N*
\(\frac{n+1}{n+2}v\text{à}\text{ }\frac{n}{n-3}\)
Vì (n+1)/(n+2)<1;n/(n-3)>1
=>(n+1)/(n+2)<n/(n-3)
So sánh :
a,\(\frac{7}{23}v\text{à}\frac{11}{28}\)
b,\(\frac{2014}{2015}+\frac{2015}{2016}v\text{à}\frac{2014+2015}{2015+2016}\)
c,A=\(\frac{2^{10}+1}{2^{11}+1}v\text{à B=\frac{2^{11}+1}{2^{12}+1}}\)
a)7/23<11/28
b)2014/2015+2015/2016>2014+2015/2015+2016
c) A= gì vậy
so sánh:
a,\(3^{34}v\text{à5}^{20}\)
b,\(71^5v\text{à}17^{20}\)
b) Ta có : \(17^{20}=\left(17^2\right)^{10}=289^{10}>71^{10}\)
\(\Rightarrow\) \(17^{20}>71^{10}\)
\(71^571^{10}>71^5\)
Vậy \(17^{20}>71^5\)
a)3^34=(3^3)^11 x 3
=27^11 x 3
5^20 = (5^2)^10
= 25^10
có 27^11 x3> 25^10(27>25 và 11>10)
suy ra 3^34>5^20
b)17^20=(17^2)^10
=289^10
có 289>71 ; 10>5
nên 71^5>17^20 .
1. so sánh
\(2^{27}v\text{à}3^{18}\)
\(3^{21}v\text{à}2^{31}\)
\(2^{27}=2^{3.9}=8^9\)
\(3^{18}=3^{2.9}=9^9\)
Vì \(9^9>8^9\Rightarrow3^{18}>2^{27}\)
MK chỉ làm đc câu a) thui nha :
2^27 = 2^ 3.9 = 8^9
3^18 = 3^2.9=9^9
Vì 9^9 > 8^9 => 2^27 < 2 ^18
So sánh:
a)\(2^{24}v\text{à}3^{16}\)
b)\(2^{300}v\text{à}3^{200}\)
c)\(71^5v\text{à}7^{20}\)
a) Ta có \(\hept{\begin{cases}2^{24}=\left(2^6\right)^4=64^4\\3^{16}=\left(3^4\right)^4=81^4\end{cases}}\)
Mà \(64< 81\)
\(\Rightarrow64^4< 81^4\)
\(\Rightarrow2^{24}< 3^{16}\)
b) Ta có \(\hept{\begin{cases}2^{300}=\left(2^3\right)^{100}=8^{100}\\3^{200}=\left(3^2\right)^{100}=9^{100}\end{cases}}\)
Mà 8 < 9
\(\Rightarrow8^{100}< 9^{100}\)
\(\Rightarrow2^{300}< 3^{200}\)
c) Ta có \(7^{20}=\left(7^4\right)^5=2401^5\)
Ta có 71 < 2401
\(\Rightarrow71^5< 2401^5\)
\(\Rightarrow71^5< 7^{20}\)
!! K chắc câu c
@@ Học tốt
Chiyuki Fujito
a) \(2^{24}=\left(2^3\right)^8=8^8\)
\(3^{16}=\left(3^2\right)^8=9^8\)
Ta thấy 8<9\(\Rightarrow8^8< 9^8\Rightarrow2^{24}< 3^{16}\)
b) \(2^{300}=\left(2^3\right)^{100}=8^{100}\)
\(3^{200}=\left(3^2\right)^{100}=9^{100}\)
Thấy \(8< 9\Rightarrow8^{100}< 9^{100}\Rightarrow2^{300}< 3^{200}\)
c) \(7^{20}=\left(7^4\right)^5=2401^5\)
Ta thấy \(71< 2401\Rightarrow71^5< 2401^5\Rightarrow71^5< 7^{20}\)
So sánh :
\(10^{30}v\text{à}2^{100}\)
\(5^{300}v\text{à}3^{453}\)
\(29^{12}v\text{à}18^{17}\)
103và 2100
Ta có:1030=(103)10=100010
2100=(210)10=102410
Vì 1000<1024 nên 1030<2100
5300 và 3453
Ta có:5300=(52)150=25150
3453=(33)151=27151=27.27150
Vì 25 < 27.27 nên 5300<3453
nhớ k ch mình nhé
So sánh :
\(a,2^{30}v\text{à}3^{20}\)
\(b,5^{300}v\text{à}3^{500}\)
\(c,2^{24}v\text{à}3^{16}\)
\(d,\left(0,3\right)^{40}v\text{à}\left(0,1\right)^{20}\)
\(\text{a, }2^{30}=8^{10}\)
\(\text{ }3^{20}=\left(3^2\right)^{10}=9^{10}\)
\(\text{Vậy }2^{30}< 3^{20}\)
\(\text{b, }5^{300}=\left(5^3\right)^{100}=125^{100}\)
\(3^{500}=\left(3^5\right)^{100}=243^{100}\)
\(\text{Vậy }5^{300}< 243^{100}\)
\(\text{c, }2^{24}=\left(2^3\right)^8=8^8\)
\(3^{16}=\left(3^2\right)^8=9^8\)
\(\text{Vậy ...}\)