1+1/2+1/4+1/8+1/16+1/32+1/64+1/128+1/256+1/512=

题目

1+

1

2

答案

1+

1

2

+

1

4

+

1

8

+

1

16

+

1

32

+

1

64

+

1

128

+

1

256

+

1

512

=1+1-

1

2

+

1

2

-

1

4

+

1

4

-

1

8

+

1

8

-

1

16

+…+

1

128

-

1

256

+

1

256

-

1

512

=2-

1

512

=1

511

512