6. Запишите в ответе номера верных равенств.
1) (4-b)(b+4) = b-16
2) -(b-1)(3-4b)=(1-b)(4b-3)
3) (b+1)(3-2b)=3+b-2b
4) (b-4)=b-8b+16
1) (4-b)(b+4) = b-16
2) -(b-1)(3-4b)=(1-b)(4b-3)
3) (b+1)(3-2b)=3+b-2b
4) (b-4)=b-8b+16
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