\(16^2\)- \(x^{2^2}\)

=>(16-\(x^2\))(16+\(x^2\))

= 3 nha !

k mik đi

đúng 100% đấy

= 2^10 . ( 13 + 65 ) / 2^8 . 104

= 2^10 . 78 / 2^8 . 104 

= 2 . 2 . 2^8 . 78 / 2^8 . 104

= 2^8 . 312 / 104 

= 3

\(\left(x+3\right)\left(x^2-3x+9\right)-x\left(x-1\right)\left(x+1\right)=27\)

\(\Leftrightarrow x^3+27-x\left(x^2-1\right)=27\)

\(\Leftrightarrow x^3-x^3+x=0\)

\(\Leftrightarrow x=0\)

Vậy x = 0

*the rooms in this hotel aren't so comfortable as the rooms in that hotel

-the rooms in that hotel are more comfortable than the rooms in this hotel.

sau 3 giờ vòi chảy dc : \(\dfrac{1}{5}+\dfrac{2}{7}+\dfrac{11}{35}=\dfrac{7}{35}+\dfrac{10}{35}+\dfrac{11}{35}=\dfrac{7+10+11}{35}=\dfrac{28}{35}\left(b\text{ể}\right)\)

Vậy sau 3 giờ , vòi vẫn chưa đầy bể 

1+2+4+8+......+256+512

Phân tích :

1+1 = 2

2+2 =4

4+4=8

...

256+256 = 512 

( Lấy 1 số cộng vs chính nó ! )

Học tốt !

Bài làm

1 + 2 + 4 + 8 + 16 + 32 + 64 + 128 + 256 + 512 

= ( 2 + 8 ) + ( 4 + 16 ) + ( 128 + 32 ) + ( 64 + 256 ) + ( 512 + 1 )

= 10 + 20 + 160 + 320 + 513

= 1023 

512 + 512=1024

x - \(\frac{9}{5}\)= 2.x

x + \(\frac{-9}{5}\)= 2.x

x - x + \(\frac{-9}{5}\)= 2.x - x

\(\frac{-9}{5}\)= x

Bài làm 

\(x-\frac{9}{5}=2x\Leftrightarrow-x=\frac{9}{5}\Leftrightarrow x=-\frac{9}{5}\)

@Hoc tot@