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2014-09-11T17:50:05+03:00
Ab+cd=47
ba+dc=173
dezvoltam nr in baza 10
10a+b+10c+d=47
10b+a+10d+c=173
adunam
11a+11b+11c+11d=220
11(a+b+c+d)=220
a+b+c+d=20
a=1
b=9
c=2
d=8
ab=19; cd=28
proba: 19+28=47
            91+82=173
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