Question

用简便方法:2+4+6+8+10+一直加到100(4年级)

必须使用简便方法

Answer 1

2+4+6+8+10+一直加到100
=(2+98)+(4+96)+……+(50+50)+100-50
=100*25+50
=2550

Answer 2

＝(98+2)+(96+4)+.......(50+50)+100-50
=100×25+50
=2550

Answer 3

2+4+6+…+98+100
=(2+100)×50÷2
=102×50÷2
=102×25
=2550