Question

Answer 1

Câu 5: \(\left\lbrack\left(0,3\right)^3\right\rbrack^4\cdot\left(0,3\right)^3\)

\(=\left(0,3\right)^{3\cdot4}\cdot\left(0,3\right)^3=\left(0,3\right)^{12}\cdot\left(0,3\right)^3\)

\(=\left(0,3\right)^{12+3}=\left(0,3\right)^{15}\)

=>Chọn C

Câu 6: \(6^8\cdot12^5\)

\(=2^8\cdot3^8\cdot\left(2^2\cdot3\right)^5\)

\(=2^8\cdot3^8\cdot2^{10}\cdot3^5=2^{18}\cdot3^{13}\)

=>a=18; b=13

=>a+b=18+13=31

=>Chọn D