1) Преобразуйте в многочлен (a+9)² *

a² + 18a - 81

a² + 18a + 81

a² -9a + 81

a² + 81a + 81

2) Преобразуйте в многочлен (2x-3y)² *

4x² - 6xy - 6y²

4x² - 36xy + 9y²

4x² - 12xy + 9y²

2x² - 36xy + 9y​
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