Ответ:
1) (a-0,4)(a+0,4)
2)(7x-2y)(7x+2y)
3)(0,9x^2-0,6y^3)
4)4b^2-1
5)9x^4-25y^2
6)0,04x^8-0,09y^2
7)(7ab^2-10c^2)(7ab^2+10c^2)
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Ответ:
1) (a-0,4)(a+0,4)
2)(7x-2y)(7x+2y)
3)(0,9x^2-0,6y^3)
4)4b^2-1
5)9x^4-25y^2
6)0,04x^8-0,09y^2
7)(7ab^2-10c^2)(7ab^2+10c^2)