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化简x²-3x/9-x²和a²+ab/a²-b²
题目详情
化简x²-3x/9-x²和a²+ab/a²-b²
▼优质解答
答案和解析
(x²-3x)/(9-x²)
=x(x-3)/(3+x)(3-x)
=-x/(x+3)
(a²+ab)/(a²-b²)
=a(a+b)/(a+b)(a-b)
=a/(a-b)
=x(x-3)/(3+x)(3-x)
=-x/(x+3)
(a²+ab)/(a²-b²)
=a(a+b)/(a+b)(a-b)
=a/(a-b)
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