对负实数a，数4a+3，7a+7，a²+8a+3依次成等差数列

（1）求a的值；

（2）若数列{a_n}满足a_n+1=aⁿ⁺¹-2a_n（n∈N₊），a₁=m，求a_n的通项公式；

（3）在（2）的条件下，若对任意n∈N₊，不等式a_2n+1＜a_2n-1恒成立，求m的取值范围．

He set up a primary school in his hometown __________ his late father.

A．in memory of

B．in place of

C．in charge of

D．in the honor of