分式的加减,(1)a²+4a/a²+2a + 4a-a²/a²+4a+4 (2)2a-3b/b²-a² - a+3b/a²-b² + a+2b/a²-b²
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![分式的加减,(1)a²+4a/a²+2a + 4a-a²/a²+4a+4 (2)2a-3b/b²-a² - a+3b/a²-b² + a+2b/a²-b²](/uploads/image/z/5540608-64-8.jpg?t=%E5%88%86%E5%BC%8F%E7%9A%84%E5%8A%A0%E5%87%8F%2C%281%29a%26%23178%3B%2B4a%2Fa%26%23178%3B%2B2a+%2B+4a-a%26%23178%3B%2Fa%26%23178%3B%2B4a%2B4+%282%292a-3b%2Fb%26%23178%3B-a%26%23178%3B+-+a%2B3b%2Fa%26%23178%3B-b%26%23178%3B+%2B+a%2B2b%2Fa%26%23178%3B-b%26%23178%3B)
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分式的加减,(1)a²+4a/a²+2a + 4a-a²/a²+4a+4 (2)2a-3b/b²-a² - a+3b/a²-b² + a+2b/a²-b²
分式的加减,
(1)a²+4a/a²+2a + 4a-a²/a²+4a+4 (2)2a-3b/b²-a² - a+3b/a²-b² + a+2b/a²-b²
分式的加减,(1)a²+4a/a²+2a + 4a-a²/a²+4a+4 (2)2a-3b/b²-a² - a+3b/a²-b² + a+2b/a²-b²
(1)a²+4a/a²+2a + 4a-a²/a²+4a+4
=a(a+4)/(a(a+2)-(a²-4a)/(a+2)²
=(a+4)(a+2)/(a+2)²-(a²-4a)/(a+2)²
=(a²+6a+8-a²+4a)/(a+2)²
=(10a+8)/(a²+4a+4)
(2)2a-3b/b²-a² - a+3b/a²-b² + a+2b/a²-b²
=(-2a+3b-a-3b+a+2b)/(a²-b²)
=(-2a+2b)/(a+b)(a-b)
=-2/(a+b)
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