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Calculeaza diferenta: (5/4-2/3)totul la 2- 1/2 la puterea 2
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Răspuns :

(5/4-2/3)²-(1/2)²=[(15-8)/12]²-1/4=(7/12)²-1/4=49/144-1/4=(49-36)/144=13/144
(5/4 - 2/3)^2 - (1/2)^2 =

= [(5×3/12 - 2×4/12)/12]^2 - 1/4 =

= (15/12 - 8/12)^2 - 1/4 =

= (7/12)^2 - 1/4 =

= 49/144 - 1/4 =

= (49 - 36)/144 =

= 13/144