3^2x-1=243
<=>3^2x-1=3^5
<=>2x-1=5
<=>2x=5+1
<=>2x=6
<=>x=6:2
<=>x=3
Vậy x = 3.
thế thôi!:D
**** cho mk nha!
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3^2x-1=243
<=>3^2x-1=3^5
<=>2x-1=5
<=>2x=5+1
<=>2x=6
<=>x=6:2
<=>x=3
Vậy x = 3.
thế thôi!:D
**** cho mk nha!
3 mũ 2x-1=243
\(\left(\dfrac{1}{3}\right)^{2x-1}\)\(=\dfrac{1}{243}\)
32x-1=243
\(3^{2x-1}=243\)
( x - 2 )^2= 1
(2x - 1)^3 = -8
(x - 1)^x+2 = (x - 1)^x+4
(2x-3)^5 = -243
Tìm x, biết:
a) \(\left(-\dfrac{1}{3}\right)^3\) .x = \(\dfrac{1}{81}\)
b) 22 . 16 >2x > 42
c) 9.27 < 3x < 243
1,3^2x-1=243
3^x+1=9
2^3x+2=4^x+5
Tìm x,y biết:
1) 3^X-1 = 1/243
2) 81^-2X x 27^X=9^5
3) ( x-y+3)^2 + (y-1)^2=0
a, (2x-3)2=16
b, (3x-2)5=-243
c, (x-7)x+1=(x-7)x+11