Представьте трёхчлен в виде квадрата двучлена:
1) b^ - 2b + 1
2) 4 + 4n + n^2
3) x^2 - 14x + 49
4) 4a^2 + 4ab + b^2
5) 9x^2 - 24xy + 16y^2
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