Ответ:
2
c2-b2-5c2+b2=-4c2
3
a) (5y-a)(5y+a)
b) (c+2b)^2
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Ответ:
2
c2-b2-5c2+b2=-4c2
3
a) (5y-a)(5y+a)
b) (c+2b)^2