\(x^3-3x^2+3x-1=\left(x-1\right)^3\)
\(a,x=-2\Leftrightarrow A=\left(x-1\right)^3=\left(-2-1\right)^3=-3^3=-27\)
\(b,x=\frac{1}{2}\Rightarrow A=\left(x-1\right)^3=\left(\frac{1}{2}-1\right)^3=\left(-\frac{1}{2}\right)^3=-\frac{1^3}{2^3}=-\frac{1}{8}\)

<=> \(\frac{123}{34}\) + x = 5 + \(\frac{3}{4}\)

=> x = \(5\frac{3}{4}-\frac{123}{34}\)

x = \(2\frac{9}{68}\)

nha bn

nha bn

x + 1/10 = 5

x = 5 - 1/10 = 50/10 - 1/10

x = 49/10

nha bn

=5 nhé

x+ 2/1 = 5/2

x = 5/2 - 2/1 

x = 1/2

nha bn

2x+5=x+1

2x    =x+1+5

2x+x=1+5

2. When did he get the job?
-> How long ago did he get the job?
3. I advise you to book a table in advance
-> If I were you, I would book a table in advance.
4. I don't want to tell them the secret
-> I would rather not tell them the secret.
5. If I improved my English speaking
-> Were I to improve my English speaking skill, I would easily get that job.
6. We wanted to get good seats so we arrived early
-> In order to get good seats, we arrived early.
7.It tookher nearly an hour to do the homework
-> She spent nearly an hour doing the crossword.
8. The policeman made him confess after there a days
-> He was made to confess after three days by the policeman.
9.Nga finds Maths easier than Physics
-> Physics is not as easy as Maths for Nga.
10. I advise you to see a doctor
-> You ought to see a doctor.

11. It's a long time since he last called me.
-> He hasn't called me for a long time.

12x4 x (a+1-a-1)

=12x4 x (a-a+1-1)

=12x4 x 0

=0

Trả lời:0

3 x 2ⁿ=48

=>2ⁿ= 48:3

=>2ⁿ=16

Mà: 2⁴=16

=> 2ⁿ=2⁴=16

=>n=4