aflati nr nat a, b, c, stiid ca: a*b=72
a*c=80
b*c=90


Răspuns :

a= 72/b
c=90/b
a*c=(72/b )*(90/b)=80
6480=80*(b^2)
b^2 = 81
b=9
a=8
c=10
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Vezi imaginea C04F