Question

Khai triển:

a) \(\left(\dfrac{1}{2}+x\right)^2\)

b) \(\left(2x+1\right)^2\)

c) \(\left(\dfrac{1}{2}-x\right)^2\)

d) \(\left(2x-1\right)^2\)

Answer 1

a: \(x^2+x+\dfrac{1}{4}\)

b: \(=4x^2+4x+1\)

c: \(=x^2-x+\dfrac{1}{4}\)

d: \(=4x^2-4x+1\)

Answer 2

`(1/2 + x)^2 = x^2 + x + 1/4`

`(2x+1)^2 = 4x^2 +4x + 1`

`(1/2 - x)^2 = x^2 - x + 1/4`

`(2x-1)^2 = 4x^2 - 4x+1`

`@ :` HĐT số `1` và HĐT số `2`

Answer 3

=x2−x+\(\dfrac{1}{4}\)

d: $=4{}^{}-4x+1$