Помогите плизз срочно

Question

Помогите плизз срочно

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Answer 1

1)(x-y)(x+y)
2)(a-6)(a+6)
3)(5-b)(5+b)
4)(7c-2d)(7c+2d)
5)(1-3a)(1+3a)
6)(4x-5)(4x+5)
7)(8-xy)(8+xy)
8)(9x-1/2y)(9x+1/2y)