Question

1+1-1+1-1+1-1+1-1+1-1+1-1+1-1+1-1+1-1+1+1-1+1-1+1-1+1-1+11-11=?

Answer 1

\(1+1-1+1-1+1-1+....+1-1+11-11\)

\(=1+\left(1-1\right)+\left(1-1\right)+\left(1-1\right)+.....+\left(1-1\right)+\left(11-11\right)\)

\(=1+0+0+0+.....+0+0\)

\(=1\)

Answer 2

1+1-1+1-1+1-1+1-1+1-1+1-1+1-1+1-1+1-1+1+1-1+1-1+1-1+1-1+11-11

=1+(1-1)+(1-1)+(1-1)+(1-1)+(1-1)+(1-1)+(1-1)+(1-1)+(1-1)+1+(1-1)+(1-1)+(1-1)+(1-1)+(11-11)

=1+0+0+0+0+0+0+0+0+0+1+0+0+0+0+0

=1+1=2

Answer 3

Nhầm

\(=1+\left(1-1\right)+\left(1-1\right)+\left(1-1\right)+....+\left(1-1\right)+\left(11-11\right)+1\)

\(=1+1\)

\(=2\)