Răspuns:
a) (x²+2y)(x²+2y)= x⁴+2x²y+2x²y+ 4y²= x⁴+ 4x²y+ 4y²
b) (4x-3y)(4x-3y)= 16x²- 12xy- 12xy+ 9y²=
= 16x²-24xy+ 9y²
c) poza
d) poza
e) (x/2-y)( x/2-y)= x²/4- xy/2- xy/2+ y²=
= x²/4- xy+ y²
f) (x+1/2)²= (x+1/2)( x+1/2)= x²+x/2+x/2+1/4=
= x²+x+ 1/4
