Ответ:
1.(7b-9b2)(7b+9b2)
2.(12a-1)2
3.(3a-2b)(9a2+6ab+4b2)
4.2(a+b)2
5.(5a+4b)(25a2-20ab+16b2)
2)
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Ответ:
1.(7b-9b2)(7b+9b2)
2.(12a-1)2
3.(3a-2b)(9a2+6ab+4b2)
4.2(a+b)2
5.(5a+4b)(25a2-20ab+16b2)
2)