viết các biểu thức sau dưới dạng lũy thừa: a) 9 x 3^2 x 1/81;b) 3^4 x 3^5 : 1/27; c) 2^6x4x32/(-2)^2x25
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25 tháng 7 2023
6:=(3/2)*(3/2)^2*(3/2)^4=(3/2)^7
7: =(1/2)^7*2^3*2^5*2^8=2^9
8: =(-1/7)^4*5^4=(-5/7)^4
9: =2^2*2^5:(2^3/2^4)
=2^7/2=2^6
10: =(1/7)^3*7^2=1/7
26 tháng 9 2021
a: \(2^6\cdot3^3=\left(2^2\cdot3\right)^3=12^3\)
b: \(6^4\cdot8^3=2^4\cdot3^4\cdot2^9=2^{13}\cdot3^4\)
c: \(16\cdot81=36^2\)
d: \(25^4\cdot2^8=100^4\)
NN
1
H9
HT.Phong (9A5)
CTVHS
13 tháng 10 2023
a) \(\dfrac{9}{4}-3y+y^2\)
\(=\left(\dfrac{3}{2}\right)^2-3y+y^2\)
\(=y^2-2\cdot\dfrac{3}{2}\cdot y+\left(\dfrac{3}{2}\right)^2\)
\(=\left(y-\dfrac{3}{2}\right)^2\)
b) \(x^3+6x^2y+12xy^2+8y^3\)
\(=x^3+6x^2y+12xy^2+\left(2y\right)^3\)
\(=x^3+3\cdot x^2\cdot2y+3\cdot x\cdot\left(2y\right)^2+\left(2y\right)^3\)
\(=\left(x+2y\right)^2\)
TK
3
T
12 tháng 7 2020
\(a,(x^3-x+1)(2x+1)+(x-1)(x+2)\)
\(=2x^4-2x^2+2x+x^3-x+1+x^2-x+2x-2\)
\(=2x^4+x^3+(-2x^2+x^2)+(2x-x-x+2x)+(1-2)\)
\(=2x^4+x^3-x^2+2x-1\)
\(b,(2x+a)(2x-3a)-5a(x+3)\)
\(=4x^2+2ax-6ax-3a^2-5ax-15a\)
\(=4x^2+(2ax-6ax-5ax)-3a^2-15a\)
\(=4x^2-9ax-3a^2-15a\)
Chúc bạn học tốt
12 tháng 7 2020
a, \(\left(x^3-x+1\right)\left(2x+1\right)+\left(x-1\right)\left(x+2\right)\)
\(=2x^4+x^3-2x^2-x+2x+1+x^2+2x-x-2\)
\(=2x^4+x^3-x^2+2x-1\)
b, \(\left(2x+a\right)\left(2x-3a\right)-5a\left(x+3\right)\)
\(=4x^2-6xa+2ax-3a^2-5ax-15a\)
\(=4x^2-9ax-3a^2-15a\)
25 tháng 7 2023
\(\dfrac{3}{2}\times\dfrac{9}{4}\times\dfrac{81}{16}=\dfrac{3}{2}\times\left(\dfrac{3}{2}\right)^2\times\left(\dfrac{3}{2}\right)^4=\left(\dfrac{3}{2}\right)^7\)
\(\left(\dfrac{1}{2}\right)^7\times8\times32\times2^8=\left(\dfrac{1}{2}\right)^7\times2^3\times2^5\times2^8=\left(\dfrac{1}{7}\right)^7\times2^{16}\)
\(\left(-\dfrac{1}{7}\right)^4\times125\times5=\left(-\dfrac{1}{7}\right)^4\times5^3\times5=\left(-\dfrac{1}{7}\right)^4\times5^4\)
\(4\times32:\left(2^3\times\dfrac{1}{16}\right)=2^2\times2^5:2^3:2^{-4}=2^0\)
\(\left(\dfrac{1}{7}\right)^2\times\dfrac{1}{7}\times49=\left(\dfrac{1}{7}\right)^3\times7^3=1^3\)
25 tháng 7 2023
6, \(\dfrac{3}{2}\times\dfrac{9}{4}\times\dfrac{81}{16}=\dfrac{3}{2}\times\left(\dfrac{3}{2}\right)^2\times\left(\dfrac{3}{2}\right)^4\)
7,\(\left(\dfrac{1}{2}\right)^7\times8\times32\times2^8=\left(\dfrac{1}{2}\right)^7\times2^3\times2^5\times2^8\)
8,\(\left(-\dfrac{1}{7}\right) ^4\times125\times5=\left(\dfrac{1}{7}\right)^4\times5^3\times5\)
9,\(4\times32:\left(2^3\times\dfrac{1}{16}\right)=2^2\times2^5:\left[2^3\times\left(\dfrac{1}{2}\right)^4\right]\)
10, \(\left(\dfrac{1}{7}\right)^2\times\dfrac{1}{7}\times49=\left(\dfrac{1}{7}\right)^2\times\dfrac{1}{7}\times7^2\)
b: \(3^4\cdot3^5:\dfrac{1}{27}==3^9\cdot3^3=3^{12}\)