Question

Tính

a) (2x + 3y)²

b) (5x - y)²

c) x² + 1/₂ x + 1/₄

_d) (1/₃x - 1/₂ y)²

e) (3x + 1)(3x - 1)

f) (x² + 2/₅ y)(x² - 2/₅ y)

Answer 1

mk chỉ cần câu c thôi

Answer 2

\(x^2+\dfrac{1}{2}x+\dfrac{1}{4}=\left(x+\dfrac{1}{2}\right)^2\)