1+1/2+2/2+1/2+1/3+2/3+3/3

1+1/2+2/2+1/2+1/3+2/3+3/3+2/3+1/3+…+1/100+2/100+…+2/100+1/10

4个回答

1+1/2+2/2+1/2+1/3+2/3+3/3+2/3+1/3+…+1/100+2/100+…+2/100+1/100
=1+2+3+……+100
=（1+100）×100/2
=5050