Insert a term with one further

1^st expression

From the following general rule in 0113

When a₃=b₃=1 together with b₂=b₂-1,

while the last negative sign remains unchanged.

2^nd expression in the same way

From Rule 2 of signs(down->front and next)

We can say that

From the following same general rule in 0113

When a₃=1 and b₃=-1 together with b₂=b₂+1,

Applying Rule 2 of signs again(down->front and next)

Finally, we have