Question

tính a) (x-1)² b) (3-y)² c) (a+2b)²

Answer 1

a: \(=x^2-2x+1\)

b: \(=y^2-6y+9\)

c: \(=a^2+4ab+4b^2\)

Answer 2

`a, = x^2 - 2x +1`

`b, = 9 - 6y + y^2`

`c, = a^2 + 4ab + 4b^2`

Answer 3

 tính

a) (x-1)²=x^2-2x+1

b) (3-y)²=y^2-6y+9

c) (a+2b)²=a^2+4ab+4b^2.