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\(a,=\left[\left(x+1\right)\left(x+5\right)\right]\left[\left(x+2\right)\left(x+4\right)\right]-40\\ =\left(x^2+6x+5\right)\left(x^2+6x+8\right)-40\\ =\left(x^2+6x\right)^2+13\left(x^2+6x\right)+40-40\\ =\left(x^2+6x\right)^2+13\left(x^2+6x\right)=\left(x^2+6x\right)\left(x^2+6x+13\right)\\ b,=a^2b^2\left(a-b\right)+b^2c^2\left(b-a+a-c\right)+c^2a^2\left(c-a\right)\\ =a^2b^2\left(a-b\right)-b^2c^2\left(a-b\right)-b^2c^2\left(c-a\right)+c^2a^2\left(c-a\right)\\ =\left(a-b\right)\left(a^2b^2-b^2c^2\right)-\left(c-a\right)\left(b^2c^2-c^2a^2\right)\\ =b^2\left(a-b\right)\left(a-c\right)\left(a+c\right)-c^2\left(c-a\right)\left(b-a\right)\left(b+a\right)\\ =\left(a-b\right)\left(a-c\right)\left[b^2\left(a+c\right)-c^2\left(b+a\right)\right]\\ =\left(a-b\right)\left(a-c\right)\left(a^2b+b^2c-b^2c+a^2c\right)\\ =a^2\left(a-b\right)\left(a-c\right)\left(b+c\right)\)
\(c,=\left(a+b\right)^3-3ab\left(a+b\right)+c^3-3abc\\ =\left(a+b+c\right)\left(a^2+2ab+b^2-ac-bc+c^2\right)-3ab\left(a+b+c\right)\\ =\left(a+b+c\right)\left(a^2+b^2+c^2-ab-bc-ac\right)\)
A=8abc+4(ab+bc+ca)+2(a+b+c)+1�=8���+4(��+��+��)+2(�+�+�)+1
A = 8abc + 4ab + 4bc + 4ca + 2a + 2b + 2c + 1
A=(8abc+4ab)+(4bc+2b)+(4ca+2a)+(2c+1)�=(8���+4��)+(4��+2�)+(4��+2�)+(2�+1)
A=4ab(2c+1)+2b(2c+1)+2a(2c+1)+(2c+1)�=4��(2�+1)+2�(2�+1)+2�(2�+1)+(2�+1)
A=(2c+1)(4ab+2a+2b+1)�=(2�+1)(4��+2�+2�+1)
A=(2c+1)[2a(2b+1)+(2b+1)]�=(2�+1)[2�(2�+1)+(2�+1)]
A=(2a+1)(2b+1)(2c+1)
=(a+b+c)(ab+bc+ca)