m²-3m除以9-m² 还有x²-4xy+4y²除以x²-4y²
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![m²-3m除以9-m² 还有x²-4xy+4y²除以x²-4y²](/uploads/image/z/11462728-40-8.jpg?t=m%26%23178%3B-3m%E9%99%A4%E4%BB%A59-m%26%23178%3B+%E8%BF%98%E6%9C%89x%26%23178%3B-4xy%2B4y%26%23178%3B%E9%99%A4%E4%BB%A5x%26%23178%3B-4y%26%23178%3B)
m²-3m除以9-m² 还有x²-4xy+4y²除以x²-4y²
m²-3m除以9-m² 还有x²-4xy+4y²除以x²-4y²
m²-3m除以9-m² 还有x²-4xy+4y²除以x²-4y²
(m²-3m)÷(9-m² )
=[m(m-3)]÷[(3+m)(3-m)]
=-m/(m+3)
(x²-4xy+4y²)÷(x²-4y²)
=(x-2y)²÷[(x-2y)(x+2y)
=(x-2y)/(x+2y)
(m²-3m)/(9-m²)
=m(m-3)/(3-m)(3+m)
=-m/(3+m)
(x²-4xy+4y²)/(x²-4y²)
=(x-2y)²/(x-2y)(x+2y)
=(x-2y)/(x+2y)