Question

Rút gọn các biểu thức sau
b, \(\left(a-b+c\right)^2-\left(b-c\right)^2+2ab-2ac\)

Answer 1

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

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

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

\(=a^2\)