1. (m+...)² = m²+ 6m +9
2. (...- 2a)² = 16-.... +4a²)
3. (a -....)² = a²+
4. (6x + ...) ² =... + (3x) (3x + ...) = 9x² - 16y² +9 +25 Пожалуйста помоги ​
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