Mr. Brown works on a farm. Mr. Green works in a park. But they don't know each other. Today is Sunday. Mr. Brown comes to the park. He feels tired. He wants to have a little rest. He sees a red chair under a tree over there. So he walks to the chair. Mr. Green is behind him. Mr. Green runs to the chair with a board when he sees Mr. Brown come to the chair. But Mr. Brown runs faster（更快） than Mr. Green. Then he sits on the chair. Mr. Brown is very happy. But Mr. Green doesn't say anything. He gives the board（板子） in his hand to Mr. Brown. It says, "Wet Paint(油漆未干). "

如下图：两个球靠在一起，看似很紧，其实接触的只是一个点，不够紧密；如果两个球都削去一片，接触的就是一个面，会十分紧密。在一个团队中，如果每一个人都是“圆球”，那么就永远融合不到一起。这启示我们要想合奏好生活的乐章，就要（   ）

①善于团结合作
②敢于直面竞争
③相互配合、科学计划
④处理好个人与集体的关系

已知（1﹣m²﹣n²）（m²+n²）=﹣6，则m²+n²的值是（　　）