Question

Tính nhẩm.

Answer 1

\(1+1=2\\ 2+1=3\\ 3+1=4\\ 1+2=3\\ 1+3=4\\ 1+4=5\\ 1+5=6\\ 2+3=5\\ 4+2=6\)

Answer 2

`1+1=2`

`2+1=3`

`3+1=4`

`1+2=3`

`1+3=4`

`1+4=5`

`1+5=6`

`2+3=5`

`4+2=6`