Question

一道数学小学的题，不难！！！！！需急！！计算题!!! 2+4+6+……+50-1-3-5-……-49

2+4+6+……+50-1-3-5-……-49

Answer 1

2+4+6+……+50-1-3-5-……-49=2-1+4-3+6-5+……+50-49=25

Answer 2

25——————2-1+4-3+6-5+8-7……共25个

Answer 3

=(2-1)+(4-3)+(6-5)+……+(50-49)
=1+1+1+……+1
=25×1
=25

Answer 4

49

Answer 5

25