TA có 13-13*1+10-10= 13- 13+10-10=0+0=0

(10*11+12*13+14*15+...+22*23+24*25)*0=0

* là dấu x nhe bạn 

thick minh nha

( 10 x 11 + 12 x 13 + 14 x 15 + ... + 22 x 23 + 24 x 25) x ( 13 - 13 x 1 + 10 -10)

= ( 10 x 11 + 12 x 13 + 14 x 15 + ... + 22 x 23 + 24 x 25) x 0

= 0

 k cho anh nha !!!!!!!!!!!!!!!! : học lớp 5 rùi

  (10 x 11 + 12 x 13 + 14 x 15 + ... + 22 x 23 + 24 x 25) x ( 13 - 13 x 1 + 10 - 10)

=( 10 x 11 + 12 x 13 + 14 x 15 + ... + 22 x 23 + 24 x 25) x 0

= 0 

tk nha

43.

ĐKXĐ: \(\left\{{}\begin{matrix}6-x>0\\log_2\left(6-x\right)\ge2\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}x< 6\\6-x\ge4\end{matrix}\right.\) \(\Rightarrow x\le2\)

C là đáp án đúng

44.

Phương trình mặt cầu:

\(x^2+\left(y-1\right)^2+\left(z+1\right)^2=4\)

C là đáp án đúng

41.

\(log_{\dfrac{1}{2}}\left(x^2-3x+2\right)\ge-1\)

\(\Leftrightarrow\left\{{}\begin{matrix}x^2-3x+2>0\\x^2-3x+2\le2\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}\left[{}\begin{matrix}x>2\\x< 1\end{matrix}\right.\\0\le x\le3\end{matrix}\right.\)

\(\Leftrightarrow\left[{}\begin{matrix}2< x\le3\\0\le x< 1\end{matrix}\right.\)

A là đáp án đúng

42.

\(\Leftrightarrow\left\{{}\begin{matrix}x-1>0\\11-2x>0\\-log_2\left(x-1\right)+log_2\left(11-2x\right)\ge0\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}x>1\\x< \dfrac{11}{2}\\log_2\left(\dfrac{11-2x}{x-1}\right)\ge0\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}1< x< \dfrac{11}{2}\\\dfrac{11-2x}{x-1}\ge1\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}1< x< \dfrac{11}{2}\\\dfrac{12-3x}{x-1}\ge0\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}1< x< \dfrac{11}{2}\\1< x\le4\end{matrix}\right.\) \(\Rightarrow1< x\le4\)

B là đáp án đúng

Section II. circle the correct answer.( khoanh tròn đáp án đúng)

          Câu 13: The pictures are ..............................the wall.

A. under                           B. in   front of                             C. on                     

Câu 14: Hung is _____________ than Son.

A The taller                      B. tallest                                     C. taller

Câu 15: Things in the city are ­­­­­­­­­­__________________ than those in the countryside.

A more expensive            B. most expensive                      C. expensiver

Câu 16: Look ! They ................................in the room.

A. am wathing                 B. watch                           C. are watching

Câu 17:  Let’s ........................... football this afternoon.

A. am wathing                 B. watch                           C. are watching

Câu 18: Can you show us the ..................to Tan Ky House?

A way                    B. road                             C. street

137/10ha = ….m²

Đáp án 137 000 m²

HT

137/10ha = 137/100000 m²

k chắc đâu nhé:))

Cảm ơn các bạn nhìu nhé:)))

A

A

B

C

A

B

A

A

C

C

câu 28 nào bạn?

Mình ko hiểu cái gì cả mà đúng cái gì