Câu trả lời:
a)\(\Leftrightarrow1,3x=4,5065+2,3185\)
\(\Leftrightarrow1,3x=6,825\)
\(\Leftrightarrow x=\dfrac{6,825}{1,3}\)\(\Leftrightarrow x=5,25\)
b)\(\Leftrightarrow x=\dfrac{16.35}{-28}\)\(\Leftrightarrow x=-20\)
c)\(\Leftrightarrow-0,2x=3,75-5,75\)
\(\Leftrightarrow-0,2x=-2\)
\(\Leftrightarrow x=\dfrac{-2}{-0,2}\)\(\Leftrightarrow x=10\)
