mình cũng có câu hỏi như thế mình cũng học cô loan mà đúng không bà là cẩm thanh mà bà cũng học cô loan mà

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kj 

Theo đề bài, ta có;
 \(a+b+c=a+d+g=c+f+i=g+h+i\)

\(=b+e+h=d+e+f=a+e+i=c+e+g\)

Từ đó ta có \(a+b+c+a+d+g+c+f+i+g+h+i\)\(=b+e+h+d+e+f+a+e+i+c+e+g\)

hay \(2a+2c+2g+2i+b+d+f+h=4e+a+b+c+d+f+g+h+i\)

hay \(a+c+g+i=4e\) (1)

Mặt khác \(a+b+c=b+e+h\)\(\Leftrightarrow a+c=e+h\)
Và \(g+h+i=b+e+h\)\(\Leftrightarrow g+i=b+e\)

Vậy \(4e=e+b+e+h\)hay \(2e=b+h\)hay \(4e=2\left(b+h\right)=\left(b+h\right)+\left(b+h\right)\)

Do \(d+e+f=b+e+h\)nên \(d+f=b+h\), từ đó \(4e=b+d+f+h\)(2)

Từ (1) và (2) ta có: \(8e=a+b+c+d+f+g+h+i\)hay \(e=\frac{a+b+c+d+f+g+h+i}{8}\)

Và đó là đpcm

194 bạn nhé

194 bạn nhé

số 9 bn nhé

giải thế nào vậy bạn

bài này hồi học lớp 3 mình làm rồi

**** cho mình đi.cùng quê mà

bạn ơi bài thế nào vậy

5 nhé , ở toán vui hàng tuần

http://www.olm.vn/hoi-dap/question/95083.html

có người làm rùi mà 

=> Số ở ô vuông nằm ở chính giữa là 5