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Elia-Belli avatar Elia-Belli commented on June 19, 2024

Ripartendo dove ci lascia il testo andiamo a sostituire alla eq $x=18+5\cdot 7t_2$
$$18+7\cdot 5t_2\equiv 4(11)\iff 7\cdot 5t_2\equiv 8(11)$$
$(7\cdot 5,11)=1$ quindi $5\cdot 7$ ammette inverso $mod(11)$, ovvero $[6]_{11}$
$$t_2\equiv 48(11)\iff t_2\equiv 4(11)\iff t_2=4+11t_3$$
Andiamo ora a sostituire $t_2$ nell'eq ottenuta finora per sostituzione:
$$x=18+5\cdot7(4+11t_3)=158+5\cdot 7\cdot 11t_3\iff x\equiv 158 (385)$$
Che è esattamente la stessa soluzione ottenuta utilizzando il Teorema Cinese del Resto in Esercizio 1

from algebra2324.

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