\(B=11,3+11,4+11,5+...+22,1+22,2\)
\(=\frac{\left(22,2+11,3\right).110}{2}\)
\(=\frac{33,5.110}{2}\)
\(=33,5\times55\)
\(=1853,5\)
Đúng 0
Bình luận (0)