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1. (5x-4)(5x+4)

2. (a+b-c)(a+b+c)

3. (2x+3y-4z)²

4. (3-5y)²

5. (x²-3)³

6. (5+x)³

7. (3x-y+2)³

8.(2-m+4n)(2-m-4n)

9.(a+2b+c+d)²

with solution po

1
by reyd

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