4x² + 4x + 1 = (2x + 1)² = [при х = 19,5] =
= (2•19,5 + 1)² = 40² = 1600
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4x² + 4x + 1 = (2x + 1)² = [при х = 19,5] =
= (2•19,5 + 1)² = 40² = 1600