Question

выполните умножение 1)(a²-5)(a²+5) 2)(4-x²)(4+x²) 3)(9x-y²)(9x+y²) 4)(5a2-3b)(5a2+3b) 5)(4m²+6n)(4m²-6n) 6)(1.3ab-1.1c)(...
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Answer 1

1)а^4-25
2)16-х^4
3)81х^2-у^4
4)100а^3-9b^2
5)16m^4-36n^2
6)хз