(x- x-4x-3)除 (x的平方-4x-3)
=[x(x-3)-(x-4)]/﹙x-3﹚÷﹙x+2﹚﹙x-2﹚/﹙x-3﹚
=﹙x²-4x+4﹚/﹙x-3﹚*﹙x-3﹚/﹙x+2﹚﹙x-2﹚
=﹙x-2﹚²/﹙x+2﹚﹙x-2﹚
=﹙x-2﹚/﹙x+2﹚
x=5
原式=﹙5-2﹚/﹙5+2﹚
=3/7
(x- x-4x-3)除 (x的平方-4x-3)
=[x(x-3)-(x-4)]/﹙x-3﹚÷﹙x+2﹚﹙x-2﹚/﹙x-3﹚
=﹙x²-4x+4﹚/﹙x-3﹚*﹙x-3﹚/﹙x+2﹚﹙x-2﹚
=﹙x-2﹚²/﹙x+2﹚﹙x-2﹚
=﹙x-2﹚/﹙x+2﹚
x=5
原式=﹙5-2﹚/﹙5+2﹚
=3/7