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{[(a=5)x5+5]x5+5}x5+5=1405

Răspuns :

(((a+5)*5+5)*5+5)*5+5=1405
scad 5
((a+5)*5+5)*5+5)*5=1400
impart la 5
((a+5)*5+5)*5+5=280
scad 5
((a+5)*5+5)*5=275
impart la 5
(a+5)*5+5=55
scad 5
(a+5)*5=50
impart la 5
a+5=10
rezulta ca a=5