Original formula =1-[x-1-1-x]? ﹙x- 1﹚？ /﹙x？ -x+ 1﹚

= 1-﹙x？ +x- 1﹚

=﹣x？ +x

When x =- 1/3

﹣x？ +x

=﹣﹙﹣ 1/3﹚? +﹣ 1/3

=﹣ 1/9+ 1/3

=﹣4/9

﹙2﹚

Original formula = (2) x/[x- 1] [(x+ 1)? ]/[﹣x﹙3﹣x﹚][﹙3﹢x﹚﹙3-x﹚]/[2﹙2-x﹚]

=﹣﹙x+ 1﹚/2x？

When x =-2

﹣﹙x+ 1﹚/2x？

= ﹣﹙﹣2+ 1﹚/2×﹙﹣2﹚?

=﹣﹙ 1﹣2﹚/﹙2×4﹚

= 1/8