Question

Giúp mik với....

Answer 1

a) \(\left(a+b\right)\left(a-b\right)=a^2-b^2\)

b) \(\left(a-b\right)\left(a^2+2ab+b^2\right)=\left(a-b\right)\left(a+b\right)^2=\left(a^2-b^2\right)\left(a+b\right)\)

\(=a^3-ab^2+a^2b-b^3\)

c) \(\left(a+b\right)\left(a^2-ab+b^2\right)=a^3+b^3\)

d) \(\left(a+b\right)\left(a+b+c\right)=\left(a+b\right)^2+c\left(a+b\right)=a^2+2ab+b^2+ca+bc\)

Answer 2

a: \(=a^2-b^2\)

b: \(=\left(a-b\right)\left(a+b\right)^2\)

\(=\left(a^2-b^2\right)\left(a+b\right)\)

\(=a^3+a^2b-ab^2-b^3\)

c: \(=a^3+b^3\)

d: \(=\left(a+b\right)^2+c\left(a+b\right)\)