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4^32=16^16
mà 16^16>16^15
suy ra 4^32>16^15
GTNN của A =2 khi x =3
\(3^{600};4^{400}\)
\(3^{600}=\left(3^3\right)^{200}\)
\(4^{400}=\left(4^2\right)^{200}\)
Vì : \(27^{200}>16^{200}\)
\(\Rightarrow3^{600}>4^{400}\)
Ta có:
\(3^{600}=3^{3\times200}=\left(3^3\right)^{200}=27^{200}\)
\(4^{400}=4^{2\times200}=\left(4^2\right)^{200}=16^{200}\)
Vì 27 > 16 \(\Rightarrow27^{200}>16^{200}\Leftrightarrow3^{600}>4^{400}\)
Ta có :
\(16^{15}=\left(4^2\right)^{15}=4^{30}\); \(4^{32}\)
Vì \(4^{30}< 4^{32}\)
=> \(16^{15}< 4^{32}\)
k mik nha
a) ta có: (-32)9 = [(-2)5 ]9 = (-2)45 = - (2)45
(-16)13 = - [ 24 ]13 = - (2)52
=> ....
b) ta có: (-5)30 = 530 = (53)10 = 12510
(-3)50 = 350 = (35)10 = 24310
=> ....
c) ta có: (-32)9 = (-2)45 = (-2)13 . 232
(-18)13 = [(-2).32 ]13 = (-2)13 . 339
=> ....
d) ta có: \(\left(-\frac{1}{16}\right)=-\left(\frac{1}{2}\right)^4.\)
\(\left(-\frac{1}{2}\right)=-\left(\frac{1}{2}\right)^1< -\left(\frac{1}{2}\right)^4\)
a) Ta có: \(25^{15}=\left(5^2\right)^{15}=5^{30}\)
\(8^{10}.3^{30}=\left(2^3\right)^{10}.3^{30}\)\(=2^{30}.3^{30}=6^{30}\)
Vì \(5^{30}< 6^{30}\)nên \(25^{15}< 8^{10}.3^{30}\)
b) Ta có: \(\frac{4^{15}}{7^{30}}=\frac{\left(2^2\right)^{15}}{7^{30}}=\frac{2^{30}}{7^{30}}\)
\(\frac{8^{10}.3^{30}}{7^{30}.4^{15}}=\frac{\left(2^3\right)^{10}.3^{30}}{7^{30}.\left(2^2\right)^{15}}=\frac{2^{30}.3^{30}}{7^{30}.2^{30}}=\frac{3^{30}}{7^{30}}\)
Vì \(2^{30}< 3^{30}\)nên \(\frac{2^{30}}{7^{30}}< \frac{3^{30}}{7^{30}}\)hay \(\frac{4^{15}}{7^{30}}< \frac{8^{10}.3^{30}}{7^{30}.4^{15}}\)
_Học tốt_
Bài làm
Đặt a - b = x ; b - c = y ; c - a = z
=> x + y + z = 0
Ta có :
\(N=\left(\frac{1}{x}+\frac{1}{y}+\frac{1}{z}\right)^2-2.\left(\frac{1}{xy}+\frac{1}{yz}+\frac{1}{xz}\right)=\left(\frac{1}{x}+\frac{1}{y}+\frac{1}{z}\right)^2-2.\left(\frac{x+y+z}{xyz}\right)\)
=> \(N=\left(\frac{1}{x}+\frac{1}{y}+\frac{1}{z}\right)^2\)( Vì x + y + z = 0 )
Vậy ta có đpcm
b) \(9^5=3^{2\cdot5}=3^{10}\)
\(27^3=3^{3\cdot3}=3^9\)
=> tự kết luận
c) \(\left(\frac{1}{8}\right)^6=\left(\frac{1}{2}^3\right)^6=\left(\frac{1}{2}\right)^{18}\)
\(\left(\frac{1}{32}\right)^4=\left(\frac{1}{2}^5\right)^4=\left(\frac{1}{2}\right)^{20}\)
=> tự kết luận
b) Ta có: \(9^5=\left(3^2\right)^5=3^{10}\)
\(27^3=\left(3^3\right)^3=3^9\)
Vì 10 > 9 => 310 > 39
Vậy 95 > 273
1. So sánh :
b) 9^5 và 27^3
9^5 = ( 3^2 )^5 = 3^10
27^3 = ( 3^3 )^3 = 3^9
Vì 3^10 > 3^9 => 9^5 > 27^3
Vậy 9^5 > 27^3
c) \(\left(\frac{1}{8}\right)^6\)và \(\left(\frac{1}{32}\right)^4\)
\(\left(\frac{1}{8}\right)^6=\left(\frac{1}{2}\right)^{3.6}=\left(\frac{1}{2}\right)^{18}\)
\(\left(\frac{1}{32}\right)^4=\left(\frac{1}{2}\right)^{5.4}=\left(\frac{1}{2}\right)^{20}\)
Vì ( 1/2)^18 < (1/2)^20 => (1/8)^6 < (1/32)^4
Vậy (1/8)^6 < (1/32)^4
a/ \(3^{600}=\left(3^3\right)^{200}=\left(27\right)^{200}\)
\(4^{400}=\left(4^2\right)^{200}=\left(16\right)^{200}\)
\(\Leftrightarrow3^{600}>4^{400}\)
b/ \(4^{32}\)
\(16^{15}=\left(4^2\right)^{15}=4^{30}\)
\(\Leftrightarrow4^{32}>16^{15}\)
a)\(3^{600}\) = \(\left(3^3\right)^{200}\) = \(27^{200}\)
\(4^{400}\) = \(\left(4^2\right)^{200}\) = \(16^{200}\)
Vì \(27>16\Rightarrow27^{200}>16^{200}=3^{600}>4^{400}\)
Vậy\(3^{600}>4^{400}\)
b) \(32^{10}=\left(2^5\right)^{10}=2^{50} \)
\(16^{15}=\left(2^4\right)^{15}=2^{60}\)
Vì \(50< 60\Rightarrow2^{50}< 2^{60}\Rightarrow32^{10}< 16^{15}\)
Vậy\(32^{10}< 16^{15}\)