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Cat face 28/31 x [1/4+(2 1/2-7/4) : 7/8] haideti va rog,dau coroana

Răspuns :

28/31 x [1/4+(2 1/2-7/4) : 7/8] =

28/31 × [1/4 + (5/2 - 7/4) : 7/8] =

28/31 × [1/4 + (10/4 - 7/4) × 8/7] =

28/31 × (1/4 + 3/4 × 8/7) =

28/31 × (1/4 + 6/7) =

28/31 × (7/28 + 24/28) =

28/31 × 31/28 =

= 1