Voi folosi semnele: / linie de fractie; ^ la puterea ... ; * inmultire ;
a) 5,23=n/10 => n = 5,23*10 = 52.3 ;
b) 12,345=12345/10^n <=> 12345 : 10^n = 12,345 adica n=1000
(ptr. ca 12345:1000 = 12,345 !) ;
c) 6,7 = n/1000 => n=6,7*1000 = 6700 ;
d) 0,789 = n/10^4 => n=0,789*10000=7890 ;
e) n/5=35,4 => n=35,4*5 = 177 ;
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f) 209/4= ab,ba => 209/4=abba / 100 => abba = (209*100)/4 = 5225 ,
deci : a=5 si b=2