[tex]x * y=x+\frac{y}{5}+1[/tex]
a)
Inlocuim pe x cu 2020 si pe y cu 5
[tex]2020+\frac{5}{5}+1=2020+1+1=2022[/tex]
b)
[tex]x * x=x+\frac{x}{5}+1[/tex]
[tex](x*x)*x=(x+\frac{x}{5}+1)*x=\frac{24}{5} \\\\x+\frac{x}{5}+1+\frac{x}{5}+1= \frac{24}{5}[/tex]
Aducem la acelasi numitor comun 5 si il eliminam:
5x+x+5+x+5=24
7x=14
x=2
c)
[tex]5^x*5^{x+1}=11\\\5^x+\frac{5^{x+1}}{5} +1=11\\\\5^x+5^x=10\\\\2\cdot 5^x=10\\\\5^x=5\\\\x=1[/tex]
Un alt exercitiu cu legi de compozitie gasesti aici: https://brainly.ro/tema/9853209
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