﹙x²-4x-21﹚÷﹙x﹢3﹚
问题描述:
﹙x²-4x-21﹚÷﹙x﹢3﹚
答
﹙x²-4x-21﹚÷﹙x﹢3﹚
=﹙x-7﹚﹙x+3﹚÷﹙x﹢3﹚
=X-7
﹙x²-4x-21﹚÷﹙x﹢3﹚
﹙x²-4x-21﹚÷﹙x﹢3﹚
=﹙x-7﹚﹙x+3﹚÷﹙x﹢3﹚
=X-7