Question

hãy viết đa thức sau dưới dạng bình phương mộthiệu 

4x²-6xy+\(\dfrac{9}{4}\)y²

Answer 1

\(=\left(2x+\dfrac{3}{2}y\right)^2\)

Answer 2

\(4x^2-6xy+\dfrac{9}{4}y^2=\left(2x\right)^2-2.2x.\dfrac{3}{2}y+\left(\dfrac{3}{2}y\right)^2=\left(2x-\dfrac{3}{2}y\right)^2\)

Answer 3

\(4x^2-6xy+\dfrac{9}{4}y^2=\left(2x-\dfrac{3}{2}y\right)^2\)