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\(5A=5^2+5^3+5^4+...+5^{100}\)
\(4A=5A-A=5^{100}-5\Rightarrow4A+5=5^{100}-5+5=5^{100}\)
`@` `\text {Ans}`
`\downarrow`
\(3^2\cdot2^5\cdot\left(\dfrac{2}{3}\right)^2\)
`=`\(\left(3\cdot\dfrac{2}{3}\right)^2\cdot2^5\)
`=`\(2^2\cdot2^5=2^7\)
\(3^2\cdot2^5\cdot\left(\dfrac{2}{3}\right)^2\)
\(=2^5\cdot\left(3\cdot\dfrac{2}{3}\right)^2\)
\(=2^5\cdot\left(\dfrac{3\cdot2}{3}\right)^2\)
\(=2^5\cdot2^2\)
\(=2^{2+5}\)
\(=2^5\)
b: \(3^4\cdot3^5:\dfrac{1}{27}==3^9\cdot3^3=3^{12}\)
a) \(x^5\cdot x^3\cdot x^2=x^{5+3+2}=x^{10}\)
b) \(\left(0,2\right)^8:0,04=\left(0,2\right)^8:\left(0,2\right)^2=\left(0,2\right)^{8-2}=\left(0,2\right)^6\)
CHÚC BẠN HỌC TỐT!!!!!!!!!!!
a)x^5.x^3.x^2=x^5+3+2=x^10
b)0,2^8:0,04=0,2^8:0,2^2=0,2^8-2=0,2^6
a/
\(9.3^2.\frac{1}{81}.27=\frac{9.3^2.27}{81}=\frac{3^2.3^2.3^3}{3^4}=\frac{3^7}{3^4}=3^3\)
b/
\(4.32:\left(2^3.\frac{1}{16}\right)=4.32:\left(\frac{2^3}{16}\right)=4.32:\left(\frac{2^3}{2^4}\right)=4.32:\frac{1}{2}=4.32.2=4.64=4.4^3=4^4\)
c/
\(3^4.3^5:\frac{1}{27}=3^4.3^5.27=3^4.3^5.3^3=3^{12}\)
d/(ý bạn là (-2)^2 hay -2^2 , mình làm theo cách (-2)^2 nhé!)
\(2^2.4.\frac{32}{\left(-2\right)^2}.2^5=2^2.2^2.\frac{2^5}{2^2}.2^5=2^2.2^2.2^3.2^5=2^{12}\)
\(=5^2\cdot\dfrac{5}{3}\cdot\dfrac{3}{5}\cdot\dfrac{3}{5}=5^2\cdot\dfrac{3}{5}=5\cdot3=15^1\)