`a)`
`3^2 xx x = 45`
`=>9 xx x = 45`
`=>x=45 : 9`
`=>x=5`
`b)`
`5^2 xx ( x-1 ) =125`
`=>25 xx ( x-1 ) =125`
`=> x-1=125 : 25`
`=> x-1=5`
`=>x=5+1`
`=>x=6`
`d)`
`( x + 2 )^3=8`
`=>( x + 2 )^3=2^3`
`=>x+2=3`
`=>x=3-2`
`=>x=1`
`e)`
`(x - 3 )^2 = 625`
`=>(x - 3 )^2 =25^2`
`Th1`
`x-3=25`
`=>x=25+3`
`=>x=28`
`Th2`
`x-3=-25`
`=>x=-25+3`
`=>x= -22`
` m`
`4^(x+2)= 256`
`=>x+2=256 : 4`
`=>x+2=64`
`=>x=64-2`
`=>x=62`
`n)`
`5^(x-1)=125`
`=>x-1=125 : 5`
`=>x-1=25`
`=>x=25 + 1`
`=>x=26`
bạn đăng tách ra nhé
a, \(9x=45\Leftrightarrow x=\dfrac{45}{9}=5\)
b, \(25\left(x-1\right)=125\Leftrightarrow x-1=5\Leftrightarrow x=6\)
b, \(64-\left(x+2\right)^2=24\Leftrightarrow\left(x+2\right)^2=40\Leftrightarrow x=2\sqrt{10}-2;x=-2\sqrt{10}-2\)
d, \(x+2=2\Leftrightarrow x=0\)
e, \(\left(x-3\right)^2=25^2\Leftrightarrow\left[{}\begin{matrix}x=28\\x-22\end{matrix}\right.\)
g, \(2x-4=2\Leftrightarrow x=3\)
`a, 9 xx x = 45`
`-> x= 5`
`b, 64 - (x+2)^2 = 24`
`-> (x+2)^2 = 40`
`-> x + 2 = +- sqrt 40`
`-> x = +-sqrt 40 - 2`
`c, 5 xx (x-1) = 125`
`x - 1 = 25`
`x = 26`
`d, (x+2)^3 = 8`
`x + 2=2`
`-> x = 0`
`e, x - 3 = 25`
`-> x = 28`
`f, 2 xx x - 4 = 4`
`-> 2 xx x = 8`
`-> x = 4`
a, 32x X = 45
9 x X = 45
X = 45 : 9
X = 5
vậy x = 5
b, 52 x ( x-1 ) =125
25 x ( x - 1) = 125
x - 1 = 125 : 25
x - 1 = 5
x = 5 + 1
x = 6
vậy x = 6
d, ( X + 2 )3=8
( X + 2)3 = 23
X + 2 = 2
X = 2 - 2
X = 0
vậy x = 0
do cái này khá dài nên mình chỉ làm ra kết quả thôi nha
mong bạn thông cảm
a) x=5
b) x=6
c) x=36
d) x=0
e) x=634
g) x=4
k) sửa lại \(2^x-1=31\)
x=5
m) x=2
n) x=4
