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afla necunoscuta [(58×a-80)÷25]×64=1280

Răspuns :

[(58×a-80)÷25]×64=1280  |÷64
(58×a-80)÷25=20  |×25
58×a-80=500  |+80
58×a=580  |÷58
a=10
[(58a-80):25]×64=1280
(58a-80):25=20
58a-80=500
58a=580
a=10