выполните умножение 1)(a-5)(a+5) 2)(4-x)(4+x) 3)(9x-y)(9x+y) 4)(5a2-3b)(5a2+3b)

Выполните умножение 1)(a-5)(a+5) 2)(4-x)(4+x) 3)(9x-y)(9x+y) 4)(5a2-3b)(5a2+3b) 5)(4m+6n)(4m-6n) 6)(1.3ab-1.1c)(...
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