Упростите выражение:
5(3-5a)^2-5(3a-7)(3a+7)
(a+1)^2+3(a-1)^2-5(a+1)(a-1)
(m-1)^2-4(m+1)^2-6(m+1)(m-1)
5(1-y)^2-(3+y)^2-3(1-y)(1+y)
5(1+m)(1-m)-(2-m))^2-8(1-m)^2
помогите пожалуйста)
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