Помогите,пожалуйста
4. Упростите выражения:
1) 3x(3x-7)-(3x+1)^2
2)(y-4)^2 - (4-y)(4+y)
3)(x+2y)^2 - (x-2y)^2
4) 3(2a-5b)^2 - 12(a-b)^2
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