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28 pe 31×paranteza dreata 1pe 4 +(2× 3pe2-7pe4)÷2pe7inchidem paranteza dreapta

Răspuns :

Needhelp112
28/31 x [1/4 + (2 x 3/2 - 7/4) : 2/7] = 
28/31 x [1/4 + (3 - 7/4) : 2/7] = 
28/31 x [1/4 + (12/4 - 7/4) : 2/7] = 
28/31 x (1/4 + 5/4 : 2/7) = 
28/31 x (1/4 + 5/4 x 7/2) =
28/31 x (1/4 + 35/8) = 
28/31 x (2/8 + 35/8) = 
28/31 x 37/8 = 
14/31 x 37/4 =
7/31 x 37/2 = 
7*37/31*2 =
259/62

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