Расложите выражение на множители по формуле а^2 - b^2 = (a - b) (a+b)
1) 16x^2 - 1
2) a^2 - 25b^2
3) x^4y^4 - 1
4) 25t^2 - (2z+3t)^2
Помогите пожалуйста
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