Question

M=Z, x compus y=x + y +xy
si
M=Z, x compus y= 7xy- 2x-2y+8
sa se studieze asociativitatea​

Answer 1

1.

$(x*y)*z=(x+y+xy)*z= x+y+xy+z+xz+yz+xyz=x+(y+z+yz)+x(y+z+yz)=x*(y*z)$