Giải:
a) \(64^3.256^2\)
\(=\left(4^3\right)^3.\left(4^4\right)^2\)
\(=4^9.4^8\)
\(=4^{9+8}\)
\(=4^{17}\)
b) \(3.3^2.3^3...3^{99}.3^{100}\)
\(=3^{1+2+3+...+99+100}\)
\(=3^{\dfrac{\left(100+1\right).100}{2}}\)
\(=3^{5050}\)
Chúc bạn học tốt!