[tex]9a-27a^4=9a(1-3a^3)=9a(1-\sqrt[3]{3}a )(\sqrt[3]{9}a^2+\sqrt[3]{3}a +1 )\\\\\\9a^2-12a+4=(3a)^2-12a+2^2=(3a-2)^2\\\\\\xy+x+5y+5=x(y+1)+5(y+1)=(y+1)(x+5)[/tex]
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9а(квадрат)-12а+4=3(квадрат)а(квадрат)-2*3а*2+2(квадрат)=(3а)квадрат-2*3а*2+2(квадрат)=(3а-2)квадрат
xy+x+5y+5= x*(y+1)+5(y+1)=(y+1)*(x+5)
[tex]9a-27a^4=9a(1-3a^3)=9a(1-\sqrt[3]{3}a )(\sqrt[3]{9}a^2+\sqrt[3]{3}a +1 )\\\\\\9a^2-12a+4=(3a)^2-12a+2^2=(3a-2)^2\\\\\\xy+x+5y+5=x(y+1)+5(y+1)=(y+1)(x+5)[/tex]