t² + 7z + 9z² = t² + 2 · 3z · 7/6 = 49/36 + 7z + 9z² = (7/6)² + 7z + 9z² =
= (7/6 + 3z)²
ответ: t = 7/6
t² + 7z + 9z² = t² + 2 · 3z · 7/6 = 49/36 + 7z + 9z² = (7/6)² + 7z + 9z² =
= (7/6 + 3z)²
ответ: t = 7/6