Question

3xy+3x+3y+2 Element Neutru si simetric??!

Answer 1

3(x+1)(y+1)-1

elem neutru

3(x+1) (e+1)-1=x

3(x+1) (e+1) =(x+1)

3(x+1) (e+1) -(x+1)=0

(x+1)(3e+3-1)=0,∀x∈D

3e+2=0

e=-2/3

x°x'=-2/3

3(x+1)(x'+1)-1=-2/3

3(x+1)* (x'+1)=1/3

(x+1) (x'+1)=1/9

x'(x+1)+x+1=1/9

x'(x+1)=-x-8/9

x'=- (x+8/9)/(x+1)= -(9x+8)/(9x+9)

admit elemente simetrice toate elementele ∈D\{-1}