计算:a²/a-b-a-b/b²;3x/x-5-2x/5-x.
问题描述:
计算:a²/a-b-a-b/b²;3x/x-5-2x/5-x.
答
第一题 是 a²/(a-b) - b²/(a-b) 吧a²/(a-b) - b²/(a-b)= (a²-b²)/(a-b)= (a+b)(a-b)/(a-b)= a+b3x/(x-5) - 2x/(5-x)=3x/(x-5) + 2x/(x-5)= 5x / (x-5)