(1)-2a³b²+8a²b²-8ab² (2) 4(x+y)²+25-20(x+y)
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![(1)-2a³b²+8a²b²-8ab² (2) 4(x+y)²+25-20(x+y)](/uploads/image/z/7127380-28-0.jpg?t=%EF%BC%881%EF%BC%89-2a%26%23179%3Bb%26%23178%3B%2B8a%26%23178%3Bb%26%23178%3B-8ab%26%23178%3B+%EF%BC%882%EF%BC%89+4%EF%BC%88x%2By%EF%BC%89%26%23178%3B%2B25-20%EF%BC%88x%2By%EF%BC%89)
(1)-2a³b²+8a²b²-8ab² (2) 4(x+y)²+25-20(x+y)
(1)-2a³b²+8a²b²-8ab² (2) 4(x+y)²+25-20(x+y)
(1)-2a³b²+8a²b²-8ab² (2) 4(x+y)²+25-20(x+y)
(1)-2a³b²+8a²b²-8ab²
=-2ab²(a²-4a-4)
=-2ab²(a-2)²
(2) 4(x+y)²+25-20(x+y)
=(2x+2y-5)²
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-ab² (a-2)²
4(x+y-5)(x+y)+25