Rút gọn :

A=\(\left(x-6\right)^2+\left(x+6\right)^2\)

B=\(\left(x+y+3\right)^2-\left(x^2+y^2+9\right)\)

C=\(\left(5x-2\right)\cdot\left(5x+2\right)-\left(5x-1\right)^2\)

D=\(\left(100^2+98^2+96^2+...+2^2\right)-\left(99^2+97^2+95^2+...+1^2\right)\)

Các câu hỏi liên quan