\(\left(3x+2y\right)^2-y^2+2xy-x^2\)
\(=\left(3x+2y\right)^2-\left(y^2-2xy+x^2\right)\)
\(=\left(3x+2y\right)^2-\left(y-x\right)^2\)
\(=\left[3x+2y-\left(y-x\right)\right].\left[3x+2y+\left(y-x\right)\right]\)
\(=\left(3x+2y-y+x\right).\left(3x+2y+y-x\right)\)
\(=\left(4x+y\right).\left(2x+3y\right)\)
Chúc bạn học tốt!