Explicație pas cu pas:
[tex] \frac{a + b}{a} = 2021 \\ a + b = a \times 2021 \\ b = 2020a = > a = \frac{b}{2020} \\ \frac{b + c}{b} = 2022 \\ b + c = b \times 2022 \\ c = 2021b \\ \frac{c + a}{c} = \frac{2021b + \frac{b}{2020}}{2021b} \\ \frac{c + a}{c} = \frac{2021 \times 2020 + 1 }{2021 \times 2020} [/tex]