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Aflati valoarea lui ,,a"
13-4 x 3:[2 x 11-1x5-(10 x 2-5 x a)]+2 x 3=13
x= inmultire



Răspuns :

13-4*3/[2*11-1*5-(10*2-5*a)]+2*3=13
13-12/[22-5-(20-5a)]+6=13
13-12/[17-(20-5a)]=7
12/[17-(20-5a)]=6
17-(20-5a)=2
20-5a=15
5a=5 => a=1