Question

20 БАЛЛОВ аЛГЕБРА
16,17

Answer 1

16
a^2-c^2-3ac+c^2= a^2-3ac=a(a-3c)

17
a^2+5ba-a^2+b^2=5ba+b^2=b(5a+b)

Answer 2

(a-c)(a+c)-c(3a-c)=a^2+ac-ac-c^2-3ac+c^2=a^2-3ac
a(a+5b)-(a+b)(a-b)=a^2+5ab-a^2+ab-ab+b^2=5ab+b^2