А) 100х² - ? + 49у² = (? - ?)²
100х² - 140ху + 49у² = (10х - 7у)²
б) 64b² + ? + 121a² = (? + ?)²
64b² + 176ab + 121a² = (8b + 11a)²
в) 81а² - 90ab + ? = (? - ?)²
81a² - 90ab + 25b² = (9a - 5b)²
г) ? + 96ху + 36у² = (? + ?)²
64х² + 96ху + 36у² = (8х + 6у)²
д) ? + 70mn + ? = (7m + ?)²
49m² + 70mn + 25n² = (7m + 5n)²
e) ? - 80ab + ? = (? - 8b)²
25a² - 80ab + 64b² = (5a - 8b)²