Giải thích các bước giải:
\(\begin{array}{l}
C1.\\
a)\,15.30 + 15.73 - 15.3\\
= 15.\left( {30 + 73 - 3} \right)\\
= 15.100\\
= 1500\\
b)\,{5^2}.165 - {65.5^2}\\
= {5^2}.\left( {165 - 65} \right)\\
= 25.100\\
= 2500\\
c)\,500:\left\{ {400:\left[ {20 - {{\left( {12 - 8} \right)}^2}} \right]} \right\}\\
= 500:\left[ {400:\left( {20 - {4^2}} \right)} \right]\\
= 500:\left[ {400:\left( {20 - 16} \right)} \right]\\
= 500:\left( {400:4} \right)\\
= 500:100\\
= 5\\
d)\,{8^{19}}:{8^{18}}.8 + {4.3^2} - {1^{2019}}\\
= {8^{19 - 18}}.8 + 4.9 - 1\\
= 8.8 + 36 - 1\\
= 64 + 36 - 1\\
= 100 - 1\\
= 99
\end{array}\)
