So sánh
a, -24 / 35 & -19 / 30
b, 2^91 & 5^35
c, 5^22 & 2^55
d, -13 / 38 & 29 / -88
e, 267 / -268 & -1347 / 1343
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a: B=31/39=62/78=1-16/78; A=35/37=280/296=1-16/296
16/78>16/296
=>B<A
b: C=23/27=46/54=1-8/54
D=1-8/29
8/29>8/54
=>D<C
\(1,\\ a,2< 3\Rightarrow2^{30}< 3^{30}\Rightarrow-2^{30}>-3^{30}\\ b,6^{10}=6^{2\cdot5}=\left(6^2\right)^5=36^5>35^5\left(36>35\right)\)
\(2,\\ a,\dfrac{\left(-3\right)^{10}\cdot15^5}{25^3\cdot\left(-9\right)^7}=\dfrac{3^{10}\cdot5^5\cdot3^5}{5^6\cdot3^{14}}=\dfrac{3}{5}\\ b,\left(8x-1\right)^{2x+1}=5^{2x+1}\\ \Leftrightarrow8x-1=5\\ \Leftrightarrow x=\dfrac{3}{4}\)
Bài 2:
a: Ta có: \(\dfrac{\left(-3\right)^{10}\cdot15^5}{25^3\cdot\left(-9\right)^7}\)
\(=\dfrac{-3^{10}\cdot3^5\cdot5^5}{5^6\cdot3^{14}}\)
\(=-\dfrac{3}{5}\)
b: Ta có: \(\left(8x-1\right)^{2x+1}=5^{2x+1}\)
\(\Leftrightarrow8x-1=5\)
\(\Leftrightarrow8x=6\)
hay \(x=\dfrac{3}{4}\)
\(a,16^{19}=\left(2^4\right)^{19}=2^{76}\\ 8^{25}=\left(2^3\right)^{25}=2^{75}\)
Vì \(2^{76}>2^{75}=>16^{19}>8^{25}\)
b,\(3^{500}=\left(3^5\right)^{100}=243^{100}\)
Vì \(243^{100}>5^{100}=>3^{500}>5^{100}\)
\(a) 3^{200}=(3^2)^{100}=9^{100}\\2^{300}=(2^3)^{100}=8^{100}\)
Vì \(9^{100}>8^{100}\) nên \(3^{200}>2^{300}\)
\(b) 5^{40}=(5^4)^{10}=625^{10}\\3^{50}=(3^5)^{10}=243^{10}\)
Vì \(625^{10}>243^{10}\) nên \(5^{40}>3^{50}\)
#\(Toru\)
a> \(3^{200}\) và \(2^{300}\)
Ta có:\(3^{200}=3^{2.100}=\left(3^2\right)^{100}=9^{100}\)
\(2^{300}=2^{3.100}=\left(2^3\right)^{100}=8^{100}\)
Vì 9>8 nên \(9^{100}>8^{100}\)
\(\Rightarrow\)\(3^{200}>2^{300}\)
b> \(5^{40}\) và \(3^{50}\)
Ta có:\(5^{40}=5^{4.10}=\left(5^4\right)^{10}=625^{10}\)
\(3^{50}=3^{5.10}=\left(3^5\right)^{10}=243^{10}\)
Vì 625 > 243 nên \(625^{10}>243^{10}\)
\(\Rightarrow\)\(5^{40}>3^{50}\)
b)
a = 25.26 261 = 25.(26 260 +1) = 25.10.2626 + 25 = 25.10.26.101 + 25
b = 26.25 251 = 26.(25 250 + 1) = 26.10.2525 + 26 = 26.10.25.101 + 26
Suy ra a < b
jihoon a bn?