Спростити вирази:1) (а+3)(4а-3) = 4а2-3а+12а-9 =4а2+9а-92) (5b-4)(3b-2) =15b2-10b-12b+8 =15b2-22b+83) (а2+3а-4)(3а-2) =3а3-2а2+9а2-6а-12а+8== 3а3+7а2-18а+84) (n-m)(n+4m) =n2+4mn-mn-4m2 == n2+3mn-4m25) (a-6b)(2a-b) = 2a2-ab-12ab+6b2 = = 2a2-13ab+6b26) (4c-3d)(3c+d) = 12c2+4cd-9cd-3d2 ==12c2-5cd-3d233