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[(420:a)×4+24]:4=11 cu verificare

Răspuns :

42o:a=(44-24):4
420:a=5
a=420:5
a=84
verificare:420:84=5
(420:a)x4+24=11x4
(420:a)x4+24=44
(420:a)x4=44-24
(420:a)x4=20
420:a=20:4
420:a=5