一、(1)(1/a+1/b)²÷(1/a²-1/b²);(2) (x/x+y+2y/x+y
来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/05/13 14:11:55
一、
(1)(1/a+1/b)²÷(1/a²-1/b²);
(2) (x/x+y+2y/x+y)·xy/x+2y÷(1/x+1/y);
(3) (a+b/a-b)²·2a-2b/3a+3b-a²/a²-b²÷a/b;
(1)(1/a+1/b)²÷(1/a²-1/b²);
(2) (x/x+y+2y/x+y)·xy/x+2y÷(1/x+1/y);
(3) (a+b/a-b)²·2a-2b/3a+3b-a²/a²-b²÷a/b;
1、=(1/a+1/b)²/(1/a+1/b)(1/a-1/b)
=(1/a+1/b)/(1/a-1/b)
=(b+a)/(b-a) 分子分母同时乘以ab
2、=(x+2y)/(x+y) ×xy/(x+2y) ÷(x+y)/xy
=xy/(x+y)×(x+y)/xy
=1
3、=(a+b)²/(a-b)² ×2(a-b)/3(a+b) -a²/(a+b)(a-b)×b/a
=2(a+b)/3(a-b) -ab/(a+b)(a-b) 这个题目感觉有点不完整
再问: �� (a+b/a-b)²��2a-2b/3a+3b-a²/a²-b²��a/b ��һ���ڸ�һ�İɣ������ġ�
再答: ��һ������ȷ��
=(1/a+1/b)/(1/a-1/b)
=(b+a)/(b-a) 分子分母同时乘以ab
2、=(x+2y)/(x+y) ×xy/(x+2y) ÷(x+y)/xy
=xy/(x+y)×(x+y)/xy
=1
3、=(a+b)²/(a-b)² ×2(a-b)/3(a+b) -a²/(a+b)(a-b)×b/a
=2(a+b)/3(a-b) -ab/(a+b)(a-b) 这个题目感觉有点不完整
再问: �� (a+b/a-b)²��2a-2b/3a+3b-a²/a²-b²��a/b ��һ���ڸ�һ�İɣ������ġ�
再答: ��һ������ȷ��
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