\(\left(x-2\right)+5=1\)

<=>\(x-2=1-5\)

<=>\(x-2=-4\)

<=>\(x=-4+2\)

<=>\(x=-2\)

\(\left(x-2\right)+5=1\) 

<=>\(x+2=-4\)

<=>\(x=-6\)

\(v\text{ậy}x=-6\)

(x-2) + 5 = 1

x-2 = 1 - 5

x - 2 = -4

x = -4 + 2

x = -2

hok tốt ...

\(\frac{1}{27}.\left(3^x\right)^2=\frac{1}{243}\Rightarrow\left(3^x\right)^2=\frac{1}{243}:\frac{1}{27}\Rightarrow\left(3^x\right)^2=\frac{1}{9}\)

\(\Rightarrow3^x=\sqrt{\frac{1}{9}}\Rightarrow3^x=\frac{1}{3}\Rightarrow3^x=3^{-1}\Rightarrow x=-1\)

<=> (3^x)^2=1/9

tính máy tinh : <=> x=-1

*nhớ tick mk đó*

mk làm đầu tiên ra -1 mà 

`4.(x+5)^3-7=101`

`4.(x+5)^3=108`

`(x+5)^3=27`  

`(x+5)^3=3^3 `

`x+5=3`

`x=-2` 

 4^x = 16 

<=> 4^x = 4²

=> x = 2

\(\left(2x-1\right)^5+243=0\)

=>\(\left(2x-1\right)^5=-243\)

=>\(\left(2x-1\right)^5=\left(-3\right)^5\)

=>2x-1=-3

=>2x=-2

=>\(x=-\dfrac{2}{2}=-1\)

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