Find the common factors of the expressions \(15x^3y^2z\) and \(45x^2y^4z^2\).

Step 1 ：First, we list the factors of each expression. For \(15x^3y^2z\), the factors are: \(3, 5, x, x, x, y, y, z\)

Step 2 ：For \(45x^2y^4z^2\), the factors are: \(3, 3, 5, x, x, y, y, y, y, z, z\)

Step 3 ：Next, we look for common factors in both lists. The common factors are: \(3, 5, x, x, y, y, z\)