Преобразуйте в многочлен ,применяя вынесение общего множителя за скобки:

а ) (b-1)(b+2)-(b-2)(b+2)+(b-3)(b+2)-(b-4)(b+2).

б ) (x+y)(x+1)-(x+y)(1-y)-(x+y)(x-y).

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