Đáp án:
Giải thích các bước giải:
Câu 2,
\[\begin{array}{*{20}{l}}
{x \times {\rm{ }}1,7 = {\rm{ }}85}\\
{{\rm{ }}{\rm{ }}{\rm{ }}{\rm{ }}x = {\rm{ }}85{\rm{ }}:{\rm{ }}1,7}\\
{{\rm{ }}{\rm{ }}{\rm{ }}{\rm{ }}x = {\rm{ }}50}
\end{array}\]
\[\begin{array}{*{20}{l}}
{x \times {\rm{ }}1,28{\rm{ }} = {\rm{ }}4,48\, \times \,3,84}\\
{x \times {\rm{ }}1,28{\rm{ }} = 17,2032}\\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,x = 17,2032{\rm{ }}:{\rm{ }}1,28}\\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,x = {\rm{ }}13,44}
\end{array}\]
