2X/x²-64y² 减去1/X-8y得多少,.解析.

问题描述:

2X/x²-64y² 减去1/X-8y得多少,.解析.

2x/﹙x²-64y²﹚-1/﹙x-8y﹚
=2x/﹙x²-64y²﹚-﹙x+8y﹚/﹙x²-64y²﹚
=﹙x-8y﹚/﹙x-8y﹚﹙x+8y﹚
=1/﹙x+8y﹚.