题目

某花农培育甲种花木2株，乙种花木3株，共需成本1700元；培育甲种花木3株，乙种花木1株，共需成本1500元1.求甲、乙两种花木每株成本分别为多少元2.根据市场调研，1株甲种花木的售价为760元，1株乙种花木的售价为540元，该花农决定在成本不超过30000元的前提下培育甲乙两种苗木，若培育乙种花木的株数是甲种花木的3倍还多10株，那么要使总利润不少于21600元，花农有哪几种具体的培育方案？ 郑和下西洋和欧洲人开辟新航路都是世界航海史上的壮举。据此回答：（1）郑和下西洋最远到达哪里？新航路开辟时，航海家达·伽马到达了亚洲的哪国？                                                                                                                                                             （2）郑和下西洋和欧洲人开辟新航路分别产生了什么影响？                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       （3）郑和下西洋体现了我国古代外交的什么传统？