Question

[hoangtuvi]

Áp dụng hằng đẳng thức đáng nhớ:

a) (a²+b+c)²

b) (a+b+c)²

Answer 1

[Minh Hiếu]

a) \(\left(a^2+b+c\right)^2\)

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

\(=a^4+2a^2b+b^2+2a^2c+2bc+c^2\)

b) \(\left(a+b+c\right)^2\)

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

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

Answer 2

[Phan An]

a) (a^2+b+c)^2(a^2+b+c)^2

=(a^2+b)^2+2(a^2+b)c+c^2

=a^4+2a2b+b^2+2a2c+2bc+c^2

b) (a+b+c)^2(a+b+c)^2

=(a+b)^2+2(a+b)c+c^2

=a^2+2ab+b^2+2ca+2bc+c^2