tính a,(x+2y)^2 b,(3x-2y)^2 c,(2x-1/2)^2 d,(x/2-y)(x/2+y) e,(x+1/3)^2 f,(x-2)(x^2+2x-4)

a,(x+2y)^2=x^2+4xy+4y^2
b,(3x-2y)^2=9x^2-12xy+4y^2
c,(2x-1/2)^2=4x^2+2x+1/4
d,(x/2-y)(x/2+y)=x^4-y^2
e,(x+1/3)^2=x^2+2/3x+1/9
f,(x-2)(x^2+2x-4)=x^3-8
              Chúc bạn học tốt!

                      _Thiênlinh_