k(k – 5) – (7 – k)² = k² – 5k – 49 + 14k – k² = 9k – 49
Подставим k = 5/9: 9 · 5/9 – 49 = 5 – 49 = –44
Ответ: –44.
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k(k – 5) – (7 – k)² = k² – 5k – 49 + 14k – k² = 9k – 49
Подставим k = 5/9: 9 · 5/9 – 49 = 5 – 49 = –44
Ответ: –44.