Упростить выражения:
а) 6b(b-2); ж) (у-2)(у+4)-2у(1+у);
б) 2с(3с-5); з) 11d(2d-3)-2d(11d-3);
в) 4а(7а+4); и) 7х(х+3)+(7х-1)(х-2);
г) (с-4)(с-6); к) 7а(4а-2)-4а(7а-4).
д) (4х-3)(х-1);
е) (а+6)(2а-3);
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