Question

1+2+3+......+100等于多少？要过程

Answer 1

1+2+3..+100
=(1+100)+(2+99)..(50+51)
=101*50
=5050

Answer 2

=( 1+100) +(2+99)+.......
=101×(100÷2)
=5050

Answer 3

（1+100）×（100÷2）=5050

追答

（1+100）×（100÷2）
=101×50
=5050

Answer 4

 

Answer 5