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calculati folosind asociativitatea
a) 4 aupra 7minus 2supra19plus2supra7plus4supra13plus1supra7plus5supra17plus11supra13minus5supra17=


Răspuns :

(4+2+1)/7-2/19+(4+11)/13= =7/7-2/19+13/13= =1-2/19+1= =2-2/19= =38/19-2/19= =36/19