Chỉ với các số 2,4,6,8,12,14,16,18 hãy điền thêm vào các ô vuông nên phải điền có được hình vuông kì diệu
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4 tháng 8 2021
Thôi khỏi cần
Lời giải chi tiết:
Gọi S là tổng số tất cả các số trong các ô vuông, T là tổng số các số ở mỗi cột, hàng, đường chéo.
Ta có S=1+2+...+9=45 nên T=45:3=15, ta có 15−α=a+c=b+d=m+n=p+q.
Có 4.(15−α)=(a+c)+(b+d)+(m+n)+(p+q).
Suy ra 60−4α=S−α=45−α.
Vậy 3α=15, hay α=5.
1 tháng 9 2015
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
25 tháng 5 2016
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kj
29 tháng 5 2015
cứ cộng 3 ô theo thẳng hình cột, ngang, chéo đều có tổng =-30
phải k?
nếu thấy đúng thì cho **** nhé các bạn