Ответ:
(-3-7у)² = (-3)² - 2•(-3)•7у + (7у)² = 9 + 42у + 49у² =
= 49у² + 42у + 9
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Ответ:
(-3-7у)² = (-3)² - 2•(-3)•7у + (7у)² = 9 + 42у + 49у² =
= 49у² + 42у + 9