упростить выражение:
1) (a+2)(a-2)
2) (3b-1)(3b+1)
3) (a+2b)(a-2b)
4) (4a-b)(4a+b)
1) (a+2)(a-2)
2) (3b-1)(3b+1)
3) (a+2b)(a-2b)
4) (4a-b)(4a+b)
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Answers & Comments
2)9b²-1
3)a²-4b²
4)16a²-b²