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