Ответ:
1) (n-9)*(n+9)2) (2/5-2m)*(2/5+2m)3) (4c-3d)*(4c+3d)
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Ответ:
1) (n-9)*(n+9)
2) (2/5-2m)*(2/5+2m)
3) (4c-3d)*(4c+3d)