[tex]x * y=\sqrt[3]{x^{3}+y^{3}+8}[/tex]
a)
Inlocuim pe x cu 2020 si pe y cu -2020
[tex]2020* (-2020)=\sqrt[3]{2020^{3}+(-2020)^{3}+8}=\sqrt[3]{8} =2[/tex]
b)
Elementul netru:
x*e=x
[tex]x * e=\sqrt[3]{x^{3}+e^{3}+8}=x\\\\\sqrt[3]{x^{3}+y^{3}+8}=x\ \ \ |^3\\\\x^3+e^3+8=x^3\\\\e^3=-8\\\\e=-2[/tex]
c)
f(x*y)=f(x)+f(y)
[tex]f(x * y)=f(\sqrt[3]{x^{3}+y^{3}+8})=x^3+y^3+8+8=x^3+y^3+16\\\\f(x)+f(y)=x^3+8+y^3+8=x^3+y^3+16[/tex]
Un alt exercitiu cu legi de compozitie gasesti aici: https://brainly.ro/tema/9882328
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