có 2 trường hợp:
a) \(\text{30 .(x) 3 + 2 - 15 + 8}\)
\(= 90 + 2 - 15 + 8\)
\(\text{= 92 - 15 + 8}\)
 \(\text{= 77 + 8 }\)
\(= 85\)

b)\(\text{ 30.(,)3 + 2 - 15 + 8}\)
\(\text{= 32,3 - 15 + 8}\)
\(\text{= 17,3 + 8}\)
\(\text{= 25,3}\)

\(Hi\)

\(\dfrac{72}{30}\cdot100=240\)

\(2^{64}=?\)

hahaha

\(\dfrac{6}{10}=\dfrac{3}{5}\)