[tex]4a {}^{2} - 4ab + b {}^{2} - 1 = (2ab - b) {}^{2} - 1 = (2a - b - 1) \times (2a - b + 1)[/tex]
певно так????
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[tex]4a {}^{2} - 4ab + b {}^{2} - 1 = (2ab - b) {}^{2} - 1 = (2a - b - 1) \times (2a - b + 1)[/tex]
певно так????