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Sa se efectueze calculele: (3 1/9 : 3 4/9 + 3/31) : 1/4 - 3 × 2/7 =

Răspuns :

Rapunzel15
3 1/9 = (3 × 9 + 1)/9 = 28/9

3 4/9 = (3 × 9 + 4) = 31/9

(28/9 : 31/9 + 3/31) : 1/4 - 3 × 2/7 =

(28/9 × 9/31 + 3/31) × 4 - 6/7 =

(28/31 + 3/31) × 4 - 6/7 =

31/31 × 4 - 6/7 =

1 × 4 - 6/7 =

4 - 6/7 =

(28 - 6)/7 =

22/7
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