Ответы на вопрос:
1) a²-b²-c²+2bc = a²-(b²-2bc+c²) = a²-(b-c)² = (a-(b-+(b-c)) = (a-b+c)(a+b-c) 2) 4c²(c+2)+9(c+2)-12c(c+2) = (c+2)(4c²+9-12c) = (c+)²-2*2c*3+3²) = = (c+2)(2c-3)²
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