for 1st graders, my opinion is it should have no standard solution.
take that example, an arithmetic sequence should suffice.
for 1st graders, my opinion is it should have no standard solution.
take that example, an arithmetic sequence should suffice.
• 是这样的,如果真的是给小学生的,应该允许五花八门的答案 -ca981- ♂ (47 bytes) () 02/05/2013 postreply 12:10:17