4(2p+3q)的平方-(3p+q)的平方
问题描述：
4(2p+3q)的平方-(3p+q)的平方
答
4(2p+3q)^2-(3p+q)^2
=(4p+6q)^2-(3p+q)^2
=(4p+6q+3p+q)(4p+6q-3p-q)
=(7p+7q)(p+5q)
=7(p+q)(p+5q)