将下列各分式约分(1)m²n+3mn²分之m²+3mn (2)x²+6x+9分之x²-9 (3)a³+2a²-15a分之a²-2a-15
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![将下列各分式约分(1)m²n+3mn²分之m²+3mn (2)x²+6x+9分之x²-9 (3)a³+2a²-15a分之a²-2a-15](/uploads/image/z/10748761-25-1.jpg?t=%E5%B0%86%E4%B8%8B%E5%88%97%E5%90%84%E5%88%86%E5%BC%8F%E7%BA%A6%E5%88%86%281%29m%26%23178%3Bn%2B3mn%26%23178%3B%E5%88%86%E4%B9%8Bm%26%23178%3B%2B3mn+%EF%BC%882%EF%BC%89x%26%23178%3B%2B6x%2B9%E5%88%86%E4%B9%8Bx%26%23178%3B-9+%EF%BC%883%EF%BC%89a%26%23179%3B%2B2a%26%23178%3B-15a%E5%88%86%E4%B9%8Ba%26%23178%3B-2a-15)
将下列各分式约分(1)m²n+3mn²分之m²+3mn (2)x²+6x+9分之x²-9 (3)a³+2a²-15a分之a²-2a-15
将下列各分式约分
(1)m²n+3mn²分之m²+3mn (2)x²+6x+9分之x²-9 (3)a³+2a²-15a分之a²-2a-15
将下列各分式约分(1)m²n+3mn²分之m²+3mn (2)x²+6x+9分之x²-9 (3)a³+2a²-15a分之a²-2a-15
(1)m²n+3mn²分之m²+3mn
原式=m(m+3n)/ mn(m+3n )=1/n
(2)x²+6x+9分之x²-9
原式=(x+3)(x-3)/(x+3)² =(x-3)/(x+3)
(3)a³+2a²-15a分之a²-2a-15
原式=(a+3)(a-5)/a(a-3)(a+5)【无法约分】
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