viết biểu thức sau dưới dạng lũy thừa
5^2: 3^5. [3/5]^2
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`@` `\text {Ans}`
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\(3^2\cdot2^5\cdot\left(\dfrac{2}{3}\right)^2\)
`=`\(\left(3\cdot\dfrac{2}{3}\right)^2\cdot2^5\)
`=`\(2^2\cdot2^5=2^7\)
\(3^2\cdot2^5\cdot\left(\dfrac{2}{3}\right)^2\)
\(=2^5\cdot\left(3\cdot\dfrac{2}{3}\right)^2\)
\(=2^5\cdot\left(\dfrac{3\cdot2}{3}\right)^2\)
\(=2^5\cdot2^2\)
\(=2^{2+5}\)
\(=2^5\)
\(5A=5^2+5^3+5^4+...+5^{100}\)
\(4A=5A-A=5^{100}-5\Rightarrow4A+5=5^{100}-5+5=5^{100}\)
b: \(3^4\cdot3^5:\dfrac{1}{27}==3^9\cdot3^3=3^{12}\)
Viết các biểu thức sau dưới dạng lũy thừa :
53 . 252 : 54
Trả lời
53 . ( 52 )2 : 54
= 53 . 54 : 54
= 57 : 54
= 53
Study well
\(5^3\cdot25^2\div5^4\)
\(=5^3\cdot\left(5^2\right)^2\div5^4\)
\(=5^3\cdot5^4\div5^4\)
\(=5^{3+4-4}=5^3\)
a, \(\frac{25.5^3.1}{25.5^2}=\frac{5^2.5^3.1}{5^2.5^2}=\frac{5^5}{5^4}=5\)
b, \(5^2.3^5.\left(\frac{3}{5}\right)^2=5^2.3^5.\frac{9}{25}=5^2.\frac{9}{25}.3^5=9.3^5=3^2.3^5=3^7\)
c, \(\left(\frac{1}{7}\right)^2\cdot\frac{1}{7}\cdot\frac{49}{2}=\frac{1}{49}\cdot\frac{1}{7}\cdot\frac{49}{2}=\frac{1}{49}\cdot\frac{49}{2}\cdot\frac{1}{7}=\frac{1}{2}\cdot\frac{1}{7}=\frac{1}{14}\)
\(\begin{array}{l}a){15^8}{.2^4} = {15^{2.4}}{.2^4} = {({15^2})^4}{.2^4}\\ = {225^4}{.2^4} = {(225.2)^4} = {450^4}\\b){27^5}:{32^3} = {({3^3})^5}:{({2^5})^3}\\ = {3^{3.5}}:{2^{5.3}} = {3^{15}}:{2^{15}} = {\left( {\frac{3}{2}} \right)^{15}}\end{array}\)
a) \(15^8\cdot2^4=3^8\cdot5^8\cdot2^4=9^4\cdot25^4\cdot2^4=\left(9\cdot25\cdot2\right)^4=450^4\)
b) \(27^5:32^3=\left(3^3\right)^5:\left(2^5\right)^3=3^{15}:2^{15}=\left(\dfrac{3}{2}\right)^{15}\)
c) \(\left(\dfrac{5}{4}\right)^4:\left(\dfrac{15}{2}\right)^4=\left(\dfrac{5}{4}:\dfrac{15}{2}\right)^4=\left(\dfrac{1}{6}\right)^4\)
d) \(10^4:16=10^4:2^4=\left(10:2\right)^4=5^4\)
e) \(\left(-2\right)^3.125=\left(-2\right)^3.5^3=\left(-2.5\right)^3=-10^3\)
f) \(64^3:\left(-2\right)^9=64^3:\left(-8\right)^3=\left(64:-8\right)^3=-8^3\)
\(=5^2\cdot\dfrac{5}{3}\cdot\dfrac{3}{5}\cdot\dfrac{3}{5}=5^2\cdot\dfrac{3}{5}=5\cdot3=15^1\)