1)(x²+b)(x²+2b)=
2)(2m+n²)(2n-m²)=
3)(x+1)(x²-x+1)=
4(a²-b)(a⁴+a²b+b²)=
5)(x²+2y)(x²+2y)-(x²-2y)(x²+2y)=
6)(a+b+c)(a+b+c)=
7)(a+b-c)(a+b-c)=
Даю 50баллов