Question

tính (2x-3y)²

Answer 1

\(\left(2x-3y\right)^2\)

\(=\left(2x\right)^2-2.2x.3y+\left(3y\right)^2\)

\(=4x^2-12xy+9y^2\)

Answer 2

Đề cis vấn đề sao

Answer 3

https://i.imgur.com/AOi7uve.jpg

Answer 4

\(\left(2x-3y\right)^2=\left(2x\right)^2-2.2x.3y+\left(3y\right)^2=4x^2-12xy+9x^2\)

(Dùng hằng đẳng thức)

Answer 5

\(\left(2x-3y\right)^2\)

= \(\left(2x\right)^2-2.2x.3y+\left(3y\right)^2\)

\(=4x^2-12xy+9y^2\)