\(\frac{101+100+99+98+...+3+2+1}{101-100+99-98+...+3-2+1}\)

\(=\frac{\frac{101.102}{2}}{51}\)

\(=101\)

\(S=1+2+2^2+...+2^{99}\)

\(S=\left(1+2\right)+\left(2^2+2^3\right)+...+\left(2^{98}+2^{99}\right)\)

\(S=3+2^2.3+...+2^{98}.3\)

\(=3\left(1+2^2+...+2^{98}\right)⋮3\)

1. + There is a TV on the table.

    - There isn't a TV on  the table.

    ? Is there a TV on the table ?

2.  + There is a brown dog in the kitchen

   - There isn't ____________________.

    ? Is there   ____________________?

3.  + There is a boy in front of the cupboard.

    - There isn't_______________________.

     ? Is there   _______________________.?

4. + There is a bath in the bathroom.

  -  There isn't__________________.

   ? Is there   __________________?

5. +There are lamps in the bedroom.

  - There aren't__________________

  ? Are there   ___________________?

Cau 1.

-There is a tv on the table.

there is not a tv on the table

Is there a tv on the table?

Cau 2

-There is a brown dog in the kitchen

-There is not a brown dog in the kitchen

-Is there brown dog in the kitchen?

 

3^x-1 + 5.3^x-1 = 162

 3^x-1. (1+5) = 162

3^x-1       =27

3^x-1        = 3^3

x-1          =3

x             = 4

Vậy x=4

\(3^{x-1}+5.3^{x-1}=162\)

\(\Rightarrow3^{x-1}.\left(1+5\right)=162\)

\(\Rightarrow3^{x-1}.6=162\)

\(\Rightarrow3^{x-1}=162:6=27=3^3\)

\(\Rightarrow x-1=3\)

\(\Rightarrow x=3+1=4\)

chu so tc la3

cần câu trả lời cụ thể mà bạn

\(\left(x-2\right)^{x+2}=\left(x-2\right)^{x+1}\)

\(\left(x-2\right)^{x+2}-\left(x-2\right)^{x+1}=0\)

\(\left(x-2\right)^{x+1}\left(x-2-1\right)=0\)

\(\left(x-2\right)^{x+1}\left(x-3\right)=0\)

\(\Rightarrow\orbr{\begin{cases}\left(x-2\right)^{x+1}=0\\x-3=0\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}x-2=0\\x=3\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}x=2\\x=3\end{cases}}\)

Vậy x = { 2; 3 }

\(\left(x-2\right)^{x+2}=\left(x-2\right)^{x+1}\)

\(\left(x-2\right)^{x+2}-\left(x-2\right)^{x+1}=0\)

\(\left(x-2\right)^{x+1}\left(x-2-1\right)=0\)

\(\Rightarrow\hept{\begin{cases}x=2\\x=3\end{cases}}\)

a) Giả sử abcdeg chia hết cho 37                     —> 999abc+(abc+deg) chia hết cho 37

—> 999abc chia hết cho 37  vì 999 :37 ko dư                                                     —>abc + deg  chia hết cho 37

1 I haven't seen him since 2016

2 We're having a great time in Cambonica!!