https://hoc24.vn/cau-hoi/bai-5-tinh-bang-cach-thuan-tien-nhat-2459-x-049-2459-x-058-2459.8006012968090
Đây bạn tôi trả lời rồi mà.
\(245,9\times0,49-245,9\times0,58+24,59\)
\(=245,9\times0,49-245,9\times0,58+245,9\times0,1\)
\(=245,9\times\left(0,49-0,58+0,1\right)\)
\(=245,9\times0,01\)
\(=2,459\)
\(345,9\times0,49-245,9\times0,58+24,59\)
\(=245,9\times\left(0,58-0,49\right)+24,59\)
\(=245,9\times0,09+24,59\)
\(=22,131+24,59\)
\(=46,721\)