[x+p]²-[x+q]² =?【2x+y】²-【x+2y】²=?16【x+y】²-9【x-y】² =?4【2x-3】²-x²=?

问题描述:

[x+p]²-[x+q]² =?【2x+y】²-【x+2y】²=?
16【x+y】²-9【x-y】² =?
4【2x-3】²-x²=?