5 mũ 15 : 25 so sánh với 5 mũ 12 ghi cách giải nha
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35=3.3.3.3.3=243
53=5.5.5=125
Vì: 243> 125=> 35> 53 (điều phải chứng minh)
35=3.3.3.3.3=243
53=5.5.5=125
Vì: 243> 125=> 35> 53 (điều phải chứng minh)
\(a,4^{333}=\left(4^3\right)^{111}=64^{111}< 81^{111}=\left(3^4\right)^{111}=3^{444}< 3^{445}\\ b,39^{15}>36^{15}=\left(6^2\right)^{15}=6^{30}\\ c,25^{45}=\left(5^2\right)^{45}=5^{90}< 5^{102}=\left(5^3\right)^{34}=125^{34}\)
ta thấy: 5^300=5^3.100=(5^3)^100=125^100
3^453=3^5.143=(3^5)^143=125^143
Vì 100<143=>125^100<125^143
hay 5^300<3^453
vậy 5^300<3^453
291 = ( 213 )7 = 81927
535 = ( 55 )7 = 31257
Vì 8192 > 3125 => 291 > 535
291>290=3218291>290=3218
535<536=2518535<536=2518
⇒291>3218>2518>535⇒291>3218>2518>535
Vậy 291>535291>535
a) Ta có :
\(27^{27}>27^{26}=\left(27^2\right)^{13}=729^{13}>243^{13}\)
\(\Rightarrow27^{27}>243^{13}\)
\(\Rightarrow-27^{27}< -243^{13}\)
\(\Rightarrow\left(-27\right)^{27}< \left(-243\right)^{13}\)
b) \(\left(\dfrac{1}{8}\right)^{25}>\left(\dfrac{1}{8}\right)^{26}=\left(\dfrac{1}{8^2}\right)^{13}=\left(\dfrac{1}{64}\right)^{13}>\left(\dfrac{1}{128}\right)^{13}\)
\(\Rightarrow\left(\dfrac{1}{8}\right)^{25}>\left(\dfrac{1}{128}\right)^{13}\)
\(\Rightarrow\left(-\dfrac{1}{8}\right)^{25}< \left(-\dfrac{1}{128}\right)^{13}\)
c) \(4^{50}=\left(4^5\right)^{10}=1024^{10}\)
\(8^{30}=\left(8^3\right)^{10}=512^{10}< 1024^{10}\)
\(\Rightarrow4^{50}>8^{30}\)
d) \(\left(\dfrac{1}{9}\right)^{17}< \left(\dfrac{1}{9}\right)^{12}< \left(\dfrac{1}{27}\right)^{12}\)
\(\Rightarrow\left(\dfrac{1}{9}\right)^{17}< \left(\dfrac{1}{27}\right)^{12}\)
a) Ta có :
2727>2726=(272)13=72913>243132727>2726=(272)13=72913>24313
⇒2727>24313⇒2727>24313
⇒−2727<−24313⇒−2727<−24313
⇒(−27)27<(−243)13⇒(−27)27<(−243)13
b) (18)25>(18)26=(182)13=(164)13>(1128)13(81)25>(81)26=(821)13=(641)13>(1281)13
⇒(18)25>(1128)13⇒(81)25>(1281)13
⇒(−18)25<(−1128)13⇒(−81)25<(−1281)13
c) 450=(45)10=102410450=(45)10=102410
830=(83)10=51210<102410830=(83)10=51210<102410
⇒450>830⇒450>830
d) (19)17<(19)12<(127)12(91)17<(91)12<(271)12
⇒(19)17<(127)12⇒(91)17<(271)12
a, \(2^{15}=\left(2^3\right)^5=8^5\)
Vì \(8^5< 27^5\Rightarrow2^{15}< 27^5\)
b, \(4^8=\left(2^2\right)^8=2^{16}\)
\(8^6=\left(2^3\right)^6=2^{18}\)
Vì \(2^{16}< 2^{18}\Rightarrow4^8< 8^6\)
c, \(25^6=\left(5^2\right)^6=5^{12}\)
\(125^5=\left(5^3\right)^5=5^{15}\)
Vì \(5^{12}< 5^{15}\Rightarrow25^6< 125^5\)
vi 25=52
suy ra 515:52=513
vi 513>512
vay 515:25>512
mình mới lớp 4 nên chịu
im sorry very much