\(\left(x+1\right)\left(2x-3\right)^5=\left(x+1\right)\sum\limits^5_{k=0}C_5^k.\left(2x\right)^k.\left(-3\right)^{5-k}\)
\(=\left(x+1\right)\sum\limits^5_{k=0}C_5^k.2^k.\left(-3\right)^{5-k}.x^k\)
Số hạng chứa \(x^4\Rightarrow\left[{}\begin{matrix}k=3\\k=4\end{matrix}\right.\)
Hệ số: \(C_5^3.2^3\left(-3\right)^2+C_5^4.2^4.\left(-3\right)^1=480\)