Explicación paso a paso:
1.....(x-y)(x+y)
2....(m-n)(m+n)
3....(a-3)(a+3)
4....(4-b)(4+b)
5....(a-1)(a+1)
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Explicación paso a paso:
1.....(x-y)(x+y)
2....(m-n)(m+n)
3....(a-3)(a+3)
4....(4-b)(4+b)
5....(a-1)(a+1)