Упростите выражение:
1) (a + 2)(a – 2)
2) (3b – 1)(3b + 1);
3) (a + 2b)(a – 2b);
4) (4a – b)(4a + b).
2) Разложите на множители:
1) 4x^2 – 1;
2) m^2 – a^2;
3) a^2 – 9y^2;
4) 49x^2 – 121a^2;
5) x^2y^2 – 1;
6) –a^4 + 16.
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