a²-b²+ac+bc=
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![a²-b²+ac+bc=](/uploads/image/z/6854876-44-6.jpg?t=a%26%23178%3B-b%26%23178%3B%2Bac%2Bbc%3D)
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a²-b²+ac+bc=
a²-b²+ac+bc=
a²-b²+ac+bc=
a²-b²+ac+bc
=(a²-b²)+(ac+bc)
=(a+b)(a-b)+c(a+b)
=(a+b)(a-b+c)
a²-b²+ac+bc
=(a+b)(a-b)+c*(a+b)
=(a+b)(a-b+c)
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