Упрастите выражение
1) (4а-b)(a-6b)+a(25b-3a)=
2)(2x+3y)(x-y)-x(x+y)=
3)3a(a+1)+(a+2)(a-3)=
4)2c(5c-3)-(c-2)(c-4)=
5)(3a+b)(a-2b)+(2a+b)(a-5b)=
6)(x+1)(x+7)-(x+2)(x+3)=
7)(a-4)(a+6)+(a-10)(a-2)=
8)(y-3)(5-y)-(4-y)(y+6)=
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