\[\boxed{\text{1270.\ }\text{еуроки}\text{-}\text{ответы}\text{\ }\text{на}\text{\ }\text{пятёрку}}\]
\[m_{з} = 6,0 \cdot 10^{21}\ т\]
\[m_{л} = 7,35 \cdot 10^{19}\ т\]
\[m_{з} - m_{л} = 6,0 \cdot 10^{21} - 7,35 \cdot\]
\[\cdot 10^{19} =\]
\[= 10^{19} \cdot \left( 6,0 \cdot 10^{2} - 7,35 \right) =\]
\[= 10^{19} \cdot (600 - 7,35) =\]
\[= 592,65 \cdot 10^{19} =\]
\[= 5,9265 \cdot 10^{21}\ т.\]
\[Ответ:\ \ на\ 5,9265 \cdot 10^{21}\ т.\]