A: Hello, Lucy.____ Is this your book?

B: No, it's not mine. Where did you find it?

A: Under the bench in the gym(体育馆).

B: When did you find it?

A:____

B: Oh,____ Because Class Two had a lesson in the gym just now.

A: Let's ask the teacher of Class Two.____

B: I'm sorry I can't go with you. I must practice the piano right away.

A:____ I will go alone. See you.

B : See you.

将HCl、H₂SO₄、Ba（NO₃）₂三种溶液，按一定顺序依次滴入到Na₂CO₃溶液中至恰好完全反应，并有以下现象：①滴加A时生成白色沉淀 ②再滴加B时沉淀溶解，并有气体逸出 ③往生成的溶液中加入C时，又有白色沉淀生成．根据上述现象，回答：

若关于x的不等式x²+ax-2>0在区间1,5上有解，则实数a的取值范围为 （ ）