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a fost răspuns

(1/2-1/3) x (1/2+1/3) x ( -1)

Răspuns :

(a-b)(a+b)=a^2-b^2, deci (1/2)^2-(1/3)^2 *(-1)
=(1/4-1/9)*(-1)= 5/36*(-1)= -(5/36)
Raspunsul meu este0.25×0.75×-1=-1