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(676:13:(31×20-31-a))×45-23×91=247

Răspuns :

Renatemambouko
(676:13:(31×20-31-a))×45-23×91=247
(52:(630-31-a))×45-2093=247
(52:(589-a))×45=247 +2093
(52:(589-a))×45=2340
52:(589-a)=2340:45
52:(589-a)=52
589-a=1
a=588



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