数学题：六年级一班有学生39人，其中男生人数的40％比女生人数的一半还多3人，六年级一班男生有多少人？

数学题解答：此题用方程解答比较容易，题中含有两个未知数，男生、女生人数都不知道。设男生为x人，则女生可以表示为（39-x）。根据题目描述，分析出数量关系：

男生人数的40%＝女生人数的1/2　+　3

可列出方程：

40%x　=　(39-x)　×　1/2　+　3

40%x　=　39/2　-　1/2　x　+　3

40%x　+　1/2　x　＝　45/2

90%x　＝　45/2

x　＝ 45/2　×　90%

x　＝　25

答：六年级一班男生有25人。　

推荐阅读：
Design: How to Solve 503 Error of API when Resources are not ava　 SteemJs Programming: What Happens on the Steem Blockchain in the　 How to Set Up Your On-Call Duty when Your Steem Witness is Missi　 Common Mistakes You Can Face With Trying to switch Your Hosting 　 Recursive Algorithm to Construct Binary Tree from Preorder and P　 10 Common Reasons Why Your Blog Doesn’t Make Money　 Trial Run During COVID: Tips for Transitioning to a Full-time Fr　 Why You Need Multiple Streams of Income　 What You Should Know About Being A Freelance Blogger　 When a Blogger Needs a Lawyer