Автор - pavkaolga

помагите пожалустаааааа​

Ответ

Автор - tshnyryova2000

1) (a - 7)(a + 7)

2) (8-b)(8+b)

3) (c - 1,5)(c + 1,5)

4) (1,7 - d)(1,7 + d)

5) (8/9 - x)(8/9 + x)

6) (10/11 - y)(10/11 + y

7) (z - 13/14)(z + 13/14)

8) (t - 20/21)(t + 20/21)

9) (5x - 6)(5x + 6)

10) (7y - 4)(7y + 4)

11) (0,8 - 1/3z)(0,8 + 1/3z)

12) (2/5t - 6)(2/5t + 6)

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