(Some classmates are talking about their weekend.)

    Linda: I stayed at home and studied over the weekend. I studied for my English test on Saturday. Yesterday I wrote a geography paper. In the evening I talked to my pen pal (笔友) on the phone. What did you do?

Tim: I had a good time. On Saturday morning I played tennis, in the afternoon I went to the beach, and in the evening I went to Nancy's birthday party. On Sunday I went to the mountains with my friends.

Mary: Oh, your weekend was great. But mine was boring. I stayed at home the whole (全)weekend. I cleaned my room and washed my clothes. I even watered the flowers. And only in the evening I watched TV for a short time. Did you go out, Dave?

Dave: No, I didn't. I stayed at home and watched TV on Saturday. Yesterday I watched a movie on TV, Fearless. It was very exciting.

图是世界海陆分布略图，读图回答问题。

已知不等式$\frac{x-2}{ax+b}>0$的解集为$\left(-1,2\right)$，m是二项式${\left(ax-\frac{b}{x^2}\right)}^6$的展开式的常数项，那么$\frac{ma}{a^7+2b^7}=$(      )