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A ; B ; C ; D ; E ; G lần lượt là 15 ; 17 ; 14 ; 12 ; 18 ;13
a) Tổng các số trong bảng = Tổng các hàng
Mà tổng các hàng bằng 0 nên tổng các số trong bảng đó bằng 0.
b) Xét hàng số 1 ta có:
a + (-2) + (-1) = 0 => a + (-3) = 0 => a = 3
Xét cột số 1 ta có:
3 + (-4) + d = 0 => (-1) + d = 0 => d = 1.
Xét đường chéo chứa b và d có:
(-1) + b + d = 0 => (-1) + b +1 = 0 => b = 0.
Xét cột số 2 ta có:
(-2) + 0 + e = 0 => e = 2
Xét dòng số 2 có:
-4 + b + c = 0 => -4 + 0 + c = 0 => c =4
Xét dòng số 3 có:
d + e + g = 0 => 1 + 2 + g = 0 => g = -3
kí hiệu các ô còn thiếu như hình vẽ
ta có 33+c+f=33+c+35
nên f=35
suy ra tổng của mỗi hàng cột đường chéo đều bằng 35+35+35=105
từ đó tìm được các số còn lại
mọi người giúp em với ạ, em cần gấp lắm rồi!!!!!!!!!!!!!!!!!!!!!!
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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