Math !!!!! Help please !!!

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i tried these quesions so many times , but i just cant get he right answer !

1.) 4(2-a)^2-81

2.) -(x-y)^3

3.)3x^2-27(2-x)^2

4.) 9(y-1)^2-25

  • Math !!!!! Help please !!! -

    shut up

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