Д)4a-12ab+5b2
Е)9c2-24cd+7d2
Ж)25a2-20ab-12b2
З)9m2-30mk+16k2
P.S m2, x2, y2 - это кофициэнт в степени
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Д)4a-12ab+5b2
Е)9c2-24cd+7d2
Ж)25a2-20ab-12b2
З)9m2-30mk+16k2
P.S m2, x2, y2 - это кофициэнт в степени
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Д) 4a^2-12ab+5b^2=4a^2-2ab+5b^2-10ab=2a(2a-b)+5b(b-2a)=(2a-b)(2a+5b)
Е) 9c^2-24cd+7d^2=9c^2-3cd-21cd+7d^2=3c(3c-d)-7d(3c-d)=(3c-d)(3c-7d)
Ж) 25a^2-20ab-12b^2=25a^2-30ab+10ab-12b^2=5a(5a-6b)+2b(5a-6b)=(5a-6b)(5a+2b)
З) 9m^2-30mk+16k^2=9m^2-6mk-24mk+16k^2=3m(3m-2k)-8k(3m-2k)=(3m-2k)(3m-8k)