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Răspuns :

(-1)totul la 4 ×2/3 ×( 1/3-5/6:5/3)
= 1×2/3×(1/3-5/6×3/5)
=2/3×(1/3-15/30)
(amplificam 1/3 cu 10)
=2/3×(10/30-15/30)
=2/3×-5/30
=-10/99