Zad.1-Wykonaj działania: a) (m+n)(m-2) + (m-n)(m+1) b) (3x-2)(3x-2y+1)-4x(2x-3y+1) c) 3(m+1)(n-2)+2(n+1)(m-2) d) x(x+1)(x+2)-x(x-1)(x-2) Poproszę obliczenia

a) (m+n)(m-2) + (m-n)(m+1)= m2-2m+nm-2n+m2-m-nm-n= 2m2+m-3n b) (3x-2)(3x-2y+1)-4x(2x-3y+1)= 9x2+4y+1-8x2+12xy-4x= x2+4y+1+12xy-4x c) 3(m+1)(n-2)+2(n+1)(m-2)= 3(mn-2m+n-2)+2(nm-2n+m-2)= 3mn-6mn+3n-6+2nm-4n+2m-4= -mn-n-10+2m d) x(x+1)(x+2)-x(x-1)(x-2)= x(x2+2x+x+2)-x(x2-2x-x+2)= x3+2x2+x2+2x-(x3-2x2-x2+2x)= x3+2x2+x2+2x-x3+2x2+x2-2x= 4x2+4x2= 8x2 Uff .. ;p