运动员剧烈运动并大量出汗时，机体通过调节维持内环境相对稳定，其中主要是（  ）
①抗利尿激素分泌增加 ②抗利尿激素分泌减少 ③胰岛A细胞的分泌活动增强  ④胰岛B细胞的分泌活动增强

    Minions(小黄人) are some small robots in a movie. They are yellow, and they always wear blue trousers. Some have one eye and some have two eyes. Their arms and legs are short, so they look very funny. Bananas are their f  6   food. Minions are small, but they are very smart. ⑵Minions work hard and they have different jobs. Some work as policemen. Some work as tennis players and some work as teachers. Many people like these cute yellow robots. Let's meet three of them.

请按要求完成下列各题

用配方法解一元二次方程ax²+bx+c=0（a≠0），此方程可变形为（　　）