1,а) 9a2 – 12ab + 4b2; в) 9a2 – 4b2;
б) (3a – 2b)2; г) (3a + 2b)2 Разложите на множители 16k2 – 49п2.
2,а) (4k – 7n)2; в) (4k – 7n)(4k + 7n);
б) (16k – 49n)2; г) (4k + 7n)2
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