Question

Alguem ai sabe calcular ?
a)(x-y)-x(x-2y) =
b)(x-2)²+a(3a+2)=
c)(m+1(m-1)+(m+1)²-2m=

Answer 1

a)(x-y)-x²+2xy
   -x+y-x²+2xy
-x²-x+y+2xy


b)x²-4x+4


c)m²-m+m-1
m²-1+m²+2m+1-2m
     m²