食物链\(a+n\)表示吃\(a\)的动物，\(a+2n\)表示被\(a\)吃的动物，同类：合并\(x\)\(y\),\(x+n\)\(y+n\),\(x+2n\)\(y+2n\)吃：合并\(x\)\(y+n\),\(x+n\)\(y+2n\),\(x+2n\)\(y\)判断假话：同类：若\(x\)\(y+n\),\(x\)\(y+2n\)假话prim板子