Разложи на множители:

1) b² - d²

2) х² - 1

3) - х² +1

4) 36 - с²

5) 4 – 25а²

6) 49а² -100

7) 900 – 81k²

8)с²р² - 1

9) 16х²- 121у²
Помогите пожалуйста ​
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