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efectuati adunarile (-2×3/4 +1×1/6)+(-1×2/3+2×3/4)

Răspuns :

(-2×3/4 +1×1/6)+(-1×2/3+2×3/4) =

-6/8 + 1/6 -2/3 + 6/8

= 1/6 - 2/3

= 1/6 - 4/6 = -3/6 = -1/2