Đặt tính rồi tính: a, 79,8 : 12 b, 15,78 + 5,13 c, 76,24 x 4,5 d, 46,57 - 1,83

* Hướng dẫn giải

$$\begin{gathered} \begin{array}{l}79,8\left|\begin{array}{l}\underset{¯}{120}\\ 6,65\end{array}\right.\\ 0780\\ 0600\\ 000\end{array} \begin{array}{l}76,24\\ \times \underset{¯}{4,5}\\ 38120\\ \underset{¯}{30496}\\ 343,080\end{array} \\ 79,8:120=6,65 76,24\times 4,5=343,080 \\ \begin{array}{l}15,78\\ +\underset{¯}{5,13}\\ 20,91\end{array} \begin{array}{l}46,57\\ -\underset{¯}{1,83}\\ 44,74\end{array} \\ 15,76+5,13=20,91 46,57-1,83=44,74 \end{gathered}$$