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Rezolvati folosind regulile de calcul cu puteri sau cum stiti :

11x(5/21-5/20-5/18) 5/21 si celelalte inseamna 5 supra 21...



Răspuns :

11×(5/21-5/20-5/18)=11×(5/21-1/4-5/18)=
21=3*7
4=2²
18=3² ×2
cmmmc=
2² ×3²×7

=11×(5×
×3×-3²×7- 2×5×7 )/2² ×3²×7 =

=11×(60-63-70 )/1260 =-11×73/252=-803/252