Tính m, n, p biết :
a, 1/3 m =1/81
b, (3/5)n=(9/25)5
c, (-0,25)p=1/256
tìm m ,n , p biết
a] [ 1/3]mũ m = 1/ 81
b] [3/5]mũ n =[9/25]mũ 5
c] [-0,25] mũ p = 1/ 256
a) \(\left(\frac{1}{3}\right)^m=\frac{1}{81}\)
\(\Rightarrow\frac{1}{3^m}=\frac{1}{81}\)
<=> 3m = 81
=> 3m = 34 ( 81 = 34 )
<=> m = 4
b) \(\left(\frac{3}{5}\right)^n=\left(\frac{9}{25}\right)^5\)
\(\left(\frac{3}{5}\right)^n=\frac{9}{9765625}\)
\(\Rightarrow\frac{3}{5^n}=\frac{9}{9765625}\)
=> 5n = 9765625
=> 5n = 510 ( 9765625 = 510 )
<=> n = 10
\(\left(-0,25\right)^p=\frac{1}{256}\)
\(\left(\frac{-1}{4}\right)^p=\frac{1}{256}\)
\(\Rightarrow\frac{-1}{4^p}=\frac{1}{256}\)
=> 4p = 256
=> 4p = 44 ( 256 = 44 )
<=> p = 4
Tính m, n, p biết
a) \(\left(\frac{1}{3}\right)^m=\frac{1}{81}\)
b) \(\left(\frac{3}{5}\right)^n=\left(\frac{9}{25}\right)^5\)
c) \(\left(-0,25\right)^p=\frac{1}{256}\)
a ) \(\left(\frac{1}{3}\right)^m=\left(\frac{1}{3}\right)^4\)
\(\Rightarrow m=4\)
b ) \(\left(\frac{3}{5}\right)^n=\left(\frac{9}{25}\right)^5\)
\(\Leftrightarrow\left(\frac{3}{5}^2\right)^n=\left(\frac{9}{25}\right)^5\)
\(\Leftrightarrow\left(\frac{9}{25}\right)^n=\left(\frac{9}{25}\right)^5\)
\(\Leftrightarrow n=5\)
c ) \(\left(-0,25\right)^p=\frac{1}{256}\)
\(\Leftrightarrow\left(-\frac{1}{4}\right)^p=\frac{1}{256}\)
\(\Leftrightarrow\left(-\frac{1}{4}\right)^p=\left(-\frac{1}{4}\right)^4\)
\(\Leftrightarrow p=4\)
\(a.\)
\(\left(\frac{1}{3}\right)^m=\frac{1}{81}\)
\(\Rightarrow\left(\frac{1}{3}\right)^m=\left(\frac{1}{3}\right)^4\)
\(\Rightarrow m=4\)
Vậy : \(m=4\)
\(b.\)
\(\left(\frac{3}{5}\right)^n=\left(\frac{9}{25}\right)^5\)
\(\Rightarrow\left(\frac{3}{5}\right)^n=\left(\frac{3}{5}\right)^{15}\)
\(\Rightarrow n=5\)
Vậy : \(n=5\)
\(c.\)
\(\left(-0,25\right)^p=\frac{1}{256}\)
\(\Rightarrow\left(-\frac{1}{4}\right)^p=\frac{1}{256}\)
\(\Rightarrow\left(-\frac{1}{4}\right)^p=\left(\frac{1}{4}\right)^4\)
\(\Rightarrow p=4\)
Vậy : \(p=4\)
Tính m , n ,p biết :
a) \(\left(\dfrac{1}{3}\right)^m=\dfrac{1}{81}\) b) \(\left(\dfrac{3}{5}\right)^n=\left(\dfrac{9}{25}\right)^5\)
c) \(\left(-0,25\right)^p=\dfrac{1}{256}\)
a) \(\left(\dfrac{1}{3}\right)^m=\dfrac{1}{81}\)
\(\Rightarrow\dfrac{1^m}{3^m}=\dfrac{1}{81}\)
\(\Rightarrow\dfrac{1}{3^m}=\dfrac{1}{3^4}\)
\(\Rightarrow m=4\)
b) \(\left(\dfrac{3}{5}\right)^n=\left(\dfrac{9}{25}\right)^5\)
\(\Rightarrow\left(\dfrac{3}{5}\right)^n=\left[\left(\dfrac{3}{5}\right)^2\right]^5\)
\(\Rightarrow\left(\dfrac{3}{5}\right)^n=\left(\dfrac{3}{5}\right)^{10}\)
\(\Rightarrow n=10\)
c) \(\left(-0,25\right)^p=\dfrac{1}{256}\)
\(\Rightarrow\left(\dfrac{-1}{4}\right)^p=\dfrac{1}{256}\)
\(\Rightarrow\left(\dfrac{-1}{4}\right)^p=\dfrac{1}{4^4}\)
\(\Rightarrow\left(\dfrac{-1}{4}\right)^p=\left(\dfrac{1}{4}\right)^4\)
\(\Rightarrow p=4\)
1 Tính m,n,p biết :
a) \(\left(\frac{1}{3}\right)^m=\frac{1}{81}\)
b) \(\left(\frac{3}{5}\right)^n=\left(\frac{9}{25}\right)^5\)
c) \(\left(-0,25\right)^p=\frac{1}{256}\)
Mình cần gấp bạn nào nhanh mình tick ạ
a/ \(\left(\frac{1}{3}\right)^m=\frac{1}{81}\)
\(\Leftrightarrow\left(\frac{1}{3}\right)^m=\left(\frac{1}{3}\right)^4\)
\(\Leftrightarrow m=4\left(tm\right)\)
b/ \(\left(\frac{3}{5}\right)^n=\left(\frac{9}{25}\right)^5\)
\(\Leftrightarrow n=10\)
\(\Leftrightarrow\left(\frac{3}{5}\right)^n=\left(\frac{3}{5}\right)^{10}\)
a)(1/3)^m=(1/3)^4
b)(3/5)^n=(3/5)^10
c)(-0,25)^p=(-0,25)^4
a)\(\left(\frac{1}{3}\right)^m=\frac{1}{81}\)
\(\left(\frac{1}{3}\right)^m=\left(\frac{1}{3}\right)^4\)
\(\Rightarrow m=4\)
vay \(m=4\)
b) \(\left(\frac{3}{5}\right)^n=\left(\frac{9}{25}\right)^5\)
\(\left(\frac{3}{5}\right)^n=\left(\frac{3}{5}\right)^{10}\)
\(\Rightarrow n=10\)
vay \(n=10\)
c) \(\left(-0,25\right)^p=\frac{1}{256}\)
\(\left(\frac{-1}{4}\right)^p=\left(\frac{1}{4}\right)^4\)
\(\Rightarrow p=4\)
voi mu duong thi \(\left(\frac{-1}{4}\right)^4=\left(\frac{1}{4}\right)^4\)
vay \(p=4\)
Bài 1 : Tìm x biết :
a, x:(3/4)^3=(3/4)^2
b, (2/5)^5.x=(2/5)^8
Bài 2:
(0,36)8 và (0,216)4
dưới dạng lũy thừ của cơ số 0,6
Bài 3 : Tính m,n,p biết :
a, (1/3)m=1/81
b, (3/5)^n=(9/25)^5
c, (-0,25)p=1/256
Giúp mình với mai mình cần rồi !!!~~~~~
Tính m,n,p biết:
a) (\(\frac{1}{3}\))\(^m\) = \(\frac{1}{81}\)
b) (\(\frac{3}{5}\))\(^n\)=(\(\frac{9}{25}\))\(^5\)
c) (-0,25)\(^p\)=\(\frac{1}{256}\)
(1/3)^4=1/81
(3/5^10)=(9/25)
(-0,25)^4=1/256
Bài 1 : Tìm x biết :
a, x:(3/4)^3=(3/4)^2
b, (2/5)^5.x=(2/5)^8
Bài 2:
(0,36)8 và (0,216)4
dưới dạng lũy thừ của cơ số 0,6
Bài 3 : Tính m,n,p biết :
a, (1/3)m=1/81
b, (3/5)^n=(9/25)^5
c, (-0,25)p=1/256
Giúp mình với mai mình cần rồi !!!~~~~~
Bài 1
a) x:(3/4)3=(3/4)2=>x=(3/4)2.(3/4)3=(3/4)2+3=(3/4)5
b) (2/5)5.x=(2/5)8=>x=(2/5)8:(2/5)5=(2/5)8-5=(2/5)3
Bài 2
(0,36)8=[ (0,6)2 ]8=(0,6)2.8=(0,6)16
(0,216)4=[ (0,6)3 ]4=(0,6)3.4=(0,6)12
Bài 3
a) (1/3)m=1/81=(1/3)4 => m=4
b) (3/5)n=(9/25)5=[ (3/5)2 ]5=(3/5)2.5=(3/5)10=>n=10
c) (-0,25)p=1/256=(1/4)4=(0,25)4=(-0,25)4=>p=4
bai3
a (1/3)^m=(1/3)^4 =>m=4
b) n=10 (làm tuong tu cau a)
c ) p=4 (doi -0.25=-1/4)
cau 2(0.36)^8=0.6)^16
(0.216)^4=0.6)12
tính m,n,p cho biết
a) \(\dfrac{1}{3}^m\)=\(\dfrac{1}{81}\) b)( \(\dfrac{3}{5}^n\) )=( \(\dfrac{9}{25})^5\) c) (-0,25)\(^p\)= \(\dfrac{1}{256}\)
(cho biết tính chất sau: vs a khác 0, a khác 1, nếu a\(^m\)=a\(^n\)thì m=n)
Tính chất bạn cho vẫn thiếu trong quá trình làm bài mình sẽ bổ sung!
a, \(\left(\dfrac{1}{3}\right)^m=\dfrac{1}{81}\)
\(\Rightarrow\left(\dfrac{1}{3}\right)^m=\left(\dfrac{1}{3}\right)^4\)
Vì \(\dfrac{1}{3}\ne\pm1;\dfrac{1}{3}\ne0\) nên \(m=4\)
b, \(\left(\dfrac{3}{5}\right)^n=\left(\dfrac{9}{25}\right)^5\)
\(\Rightarrow\left(\dfrac{3}{5}\right)^n=\left(\dfrac{3}{5}\right)^{10}\)
Vì \(\dfrac{3}{5}\ne\pm1;\dfrac{3}{5}\ne0\) nên \(n=10\)
c, \(\left(-0,25\right)^p=\dfrac{1}{256}\) \(\Rightarrow\left(-\dfrac{1}{4}\right)^p=\left(-\dfrac{1}{4}\right)^4\) Vì \(\dfrac{-1}{4}\ne\pm1;\dfrac{-1}{4}\ne0\) nên \(p=4\) Chúc bạn học tốt!!!a)\(\left(\dfrac{1}{3}\right)^m=\dfrac{1}{81}\)
=>\(\left(\dfrac{1}{3}\right)^m=\left(\dfrac{1}{3}\right)^4\)
=>\(m=4\)
b)\(\left(\dfrac{3}{5}\right)^m=\left(\dfrac{9}{25}\right)^5\)
=>\(\left(\dfrac{3}{5}\right)^m=\left(\dfrac{3}{5}\right)^{10}\)
=>\(m=10\)
c)\(\left(-0,25\right)^p=\dfrac{1}{256}\)
=>\(\left(-0,25\right)^p=\left(\dfrac{1}{4}\right)^4\)
=>\(p=4\)
Viết các số: (0,36)8 và (0,216)4 dưới dạng lũy thừa của cơ số 0,6.
Tính giá trị của các biểu thức sau \(x = {(0,125)^5 . (2,4)^5 \over (-0,3)^5.(0,01)^3}\)
Tính m,n,p biết:
a)(1/3)m = 1/81
b) (3/5)n=(9/25)5
c)(-0,25)p=1/256
( Cho biết tính chất sau : với a khác 0, khác 1 ; nếu am =an thì m=n)
So sánh các cặp số sau:
a) 128 và 812
b) (-5)39 và (-2)91