\(153^2+153.94+47^2\)
\(=153^2+2.153.47+47^2\)
\(=\left(153+47\right)^2\)
\(=200^2=40000\)
Mình sửa lại đề bài nhé
\(x^2+4y^2+2\left(3x+6y+2xy\right)+9\)
\(=x^2+4y^2+6x+12y+4xy+9\)
\(=\left(x^2+4xy+4y^2\right)+\left(6x+12y\right)+9\)
\(=\left(x+2y\right)^2+6\left(x+2y\right)+9\)
\(=\left(x+2y\right)^2+2.\left(x+2y\right).3+3^2\)
\(=\left(x+2y+3\right)^2\)
Chúc bạn học tốt.