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Calculati , folosind eventual proprietatea de asiciativitate:

a) 4/7-2/13+2/7+4/13+1/7+5/17+11/13-5/17

b) 2,5*1,6*4*0,5


Răspuns :

a) (4+2+1)/2 + (-2+4+11)/13 = 7/7 + 13/13 = 2
b) 4*4*0.5=4*2=8