Làm tính nhân:
a) \((\dfrac{1}{2}x+y)(\dfrac{1}{2}x+y)\)
b) \((x-\dfrac{1}{2}y)(x-\dfrac{1}{2}y)\)
a) \((\dfrac{1}{2}x+y)(\dfrac{1}{2}x+y) = \dfrac{1}{4}x^2+\dfrac{1}{2}xy+\dfrac{1}{2}xy+y^2= \dfrac{1}{4}x^2+xy+y^2\)
b) \((x-\dfrac{1}{2}y)(x-\dfrac{1}{2}y) = x^2-\dfrac{1}{2}xy-\dfrac{1}{2}xy+\dfrac{1}{4}y^2 = x^2-xy+\dfrac{1}{4}y^2\)
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